im unsure about trademark problems gtalk messenger has been into existence recently , and domains existed before gtalk came in, may be a gtalk.com so gtalky seems ok as long as u dnt have somethg related to google in it. though the valuation would be low xx at this point of time, developed domain would give you high value
Gtalky.com can be a Gtalk community, it is quite a good valuable domain to be developed, please do not sell it for anything less than $xxx at this point of time, develop a forum for it, send emails to people who use Gtalk and build a good community for friendmaking, you will get a nice traffic, put some resources like mess.be does for MSN messenger and the site will be worth a good mid to high $xxx soon IT