"Just Stand Up" to be heard on both the SIRIUS and XM services on SIRIUS Hits 1 SIRIUS channel 1 and 20 on 20 XM channel 20 and The Pink Channel XM channel 24

NEW YORK, Aug 26, 2008 /PRNewswire-FirstCall via COMTEX News Network/ -- SIRIUS XM Radio (Nasdaq: SIRI)
is partnering with the Entertainment Industry Foundation's Stand Up To Cancer
(SU2C) Campaign to broadcast its "Just Stand Up" national fundraising event
live on Friday, September 5. With a focus of raising philanthropic dollars
for accelerating ground-breaking cancer research, the hour-long live broadcast
will feature a who's who from the worlds of music, film, television and
sports, including the premiere performance of "Just Stand Up," the charity
single recorded in support of SU2C that features more than a dozen of the
world's most accomplished female recording artists -- a cast that includes
Mariah Carey, Beyonce, Mary J. Blige, Rihanna, Fergie, Sheryl Crow, Miley
Cyrus, Melissa Etheridge, Ashanti, Natasha Bedingfield, Keyshia Cole, Ciara,
Leona Lewis, LeAnn Rimes, and Carrie Underwood.

SIRIUS XM's broadcast will air live from 8-9 pm ET on both SIRIUS and XM
on SIRIUS Hits 1 SIRIUS channel 1 and 20 on 20 XM channel 20 and The Pink
Channel XM channel 24 -- joining ABC, CBS and NBC as part of this
unprecedented, commercial-free national simulcast. This will be the first
simultaneous cross-network broadcast ever to raise funds for the fight against
a disease.

In addition to performances by legendary recording artists, the Stand Up
To Cancer special will feature stars from film and television who will perform
as well as present filmed content giving viewers insight into cancer. Network
news anchors Charles Gibson, Katie Couric and Brian Williams will report on
potentially life-saving research, speaking with both patients and scientists.
Celebrities confirmed for the broadcast (both for personal appearances or
answering telephone calls) include: Casey Affleck, Jennifer Aniston, Christina
Applegate, Lance Armstrong, Abigail Breslin, Josh Brolin, David Cook, Katie
Couric, Dana Delany, Fran Drescher, Julia Louis-Dreyfus, Kirsten Dunst,
Elizabeth Edwards, Jon Favreau, America Ferrera, Charles Gibson, Neil Patrick
Harris, Salma Hayek, Scarlett Johansson, Masi Oka, Danica Patrick, Christina
Ricci, Robin Roberts, Homer Simpson, Marge Simpson, Meryl Streep, Hilary
Swank, Charlize Theron, Goran Visnjic, Forest Whitaker, Brian Williams and
Reese Witherspoon. Additional participants and musical performers are still
to be announced.

About SIRIUS XM Radio

SIRIUS XM Radio is America's satellite radio company delivering "The Best
Radio on Radio" to more than 18 million subscribers, including 100% commercial
free music, and premier sports, news, talk, entertainment, traffic and
weather.

SIRIUS XM Radio has exclusive content relationships with an array of
personalities and artists, including Howard Stern, Oprah, Martha Stewart,
Jimmy Buffett, Elvis, Jamie Foxx, Barbara Walters, Frank Sinatra, Opie &
Anthony, The Grateful Dead, Willie Nelson, Bob Dylan, Dale Earnhardt Jr., Tom
Petty, and Bob Edwards. SIRIUS XM Radio is the leader in sports programming as
the Official Satellite Radio Partner of the NFL, Major League Baseball,
NASCAR, NHL, and PGA Tour, and broadcasts major college sports.

SIRIUS XM Radio has exclusive arrangements with every major automaker.
SIRIUS XM Radio products are available at shop.sirius.com and
shop.xmradio.com, and at retail locations nationwide, including Best Buy,
Circuit City, RadioShack, Target, Sam's Club, and Wal-Mart.

SIRIUS XM Radio also offers SIRIUS Backseat TV, the first ever live
in-vehicle rear seat entertainment featuring Nickelodeon, Disney Channel and
Cartoon Network; XM NavTraffic service for GPS navigation systems delivers
real-time traffic information, including accidents and road construction, for
more than 80 North American markets.

This communication contains "forward-looking statements" within the
meaning of the Private Securities Litigation Reform Act of 1995. Such
statements include, but are not limited to, statements about the benefits of
the business combination transaction involving Sirius Satellite Radio Inc. and
XM Satellite Radio Holdings Inc., including potential synergies and cost
savings and the timing thereof, future financial and operating results, the
combined company's plans, objectives, expectations and intentions with respect
to future operations, products and services; and other statements identified
by words such as "anticipate," "believe," "plan," "estimate," "expect,"
"intend," "will," "should," "may," or words of similar meaning. Such forward-
looking statements are based upon the current beliefs and expectations of
SIRIUS' and XM's management and are inherently subject to significant
business, economic and competitive uncertainties and contingencies, many of
which are difficult to predict and generally beyond the control of SIRIUS and
XM. Actual results may differ materially from the results anticipated in
these forward-looking statements.

The following factors, among others, could cause actual results to differ
materially from the anticipated results or other expectations expressed in the
forward-looking statement: general business and economic conditions; the
performance of financial markets and interest rates; the ability to obtain
governmental approvals of the transaction on a timely basis; the failure to
realize synergies and cost-savings from the transaction or delay in
realization thereof; the businesses of SIRIUS and XM may not be combined
successfully, or such combination may take longer, be more difficult, time-
consuming or costly to accomplish than expected; and operating costs and
business disruption following the merger, including adverse effects on
employee retention and on our business relationships with third parties,
including manufacturers of radios, retailers, automakers and programming
providers. Additional factors that could cause SIRIUS' and XM's results to
differ materially from those described in the forward-looking statements can
be found in SIRIUS' and XM's Annual Reports on Form 10-K for the year ended
December 31, 2007, which are filed with the Securities and Exchange Commission
(the "SEC") and available at the SEC's Internet site (http://www.sec.gov).
The information set forth herein speaks only as of the date hereof, and SIRIUS
and XM disclaim any intention or obligation to update any forward looking
statements as a result of developments occurring after the date of this
communication.

SOURCE SIRIUS XM Radio

http://www.xmradio.com

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