Dog. Bone(r). (Mildly NSFW.)
http://community.livejournal.com/techsupport/1779648.html -- excellent list of no-nos. I would occasionally quote from a customer in just such a way...
http://www.theregister.co.uk/2008/06/26/icann_approves_customized_top_level_domains/ -- oh god. >_< ... (see, I work for a little local domains-'n'-more shop. This is going to make work ... interesting. I am pretty sure that a fuckton of our architecture, like hosting, is not going to be built to take domain names ending in things like .yourmom ...)