I have been asked this question many times when I have in the past sold domains with ipad...apple....twitter etc contain within them.
The answer is that not all trademark holders pursue legal action at every chance they get ...as long as its not directly affecting thier business.
2 Examples ;
Apple do not ususally give you a problem unless you start advertising simlar products but the BBC (UK broadcaster) hunts everyone down trying to use BBC in domains and will track you down quick and take legal action instantly.
The above is not legal advice..if unsure always consult your lawyer.
ps ..A nice facebook style popup/IM tool you may wish to use to promote this program is
www.ChatPopBox.com