Would you like to send your name into space?
Submit your name and it will be stored on a DVD and rocketed into space on board the Kepler spacecraft.
The deadline to submit your name is November 1, 2008.

Read more (http://namesinspace.seti.org/)

(site is down just now)

also...

Sign up to send your name to the moon.

"Names will be collected and placed onboard the LRO spacecraft for its historic mission bringing NASA back to the moon. You will also receive a certificate showcasing your support of the mission.
The deadline is June 27, 2008 for the submission of names."

Read more (http://lro.jhuapl.edu/NameToMoon/)

The LRO is scheduled for launch in late 2008.

I did this about ten years ago with a previous mission,.... not only were my and my gf's names on that launch, my cats were too!