Hi
Just like .xxx this is really going to work :)
I *would* have sort of understood a .kids, .friendly or a .prudent domain actually. Then when those domains got monitored really well those sites could really be 'friendly' to kids and other such types. .xxx is not going to cut it, I guess ICANN didn't read RFC3675... http://www.ietf.org/rfc/rfc3675.txt
I like OpenNIC's .geek :)
http://www.opennic.unrated.net/tlds.html
Daniel