So here's my latest project: http://onetimechat.org/
It just lets you give someone a chat link to talk over one time. It might be useful for friend-of-a-friend tech help, or supplementing a phone conversation. The person you talk to shouldn't be able to reach you or track you by any means other than those which you disclose.
I started with a (absolutely terrible) Omegle clone in PHP with message passing storage in MySQL. Rewrote it in WebLua with message handling in memory through a circular buffer.
Hope someone will find it useful :-).
Update: I've taken down the site. You can find the ugly, old code on Github: https://github.com/teran-mckinney/onetimechat