Not that I really needed one, but I found a really simple-to-implement Flash-based chat app. It's embedded in the sidebar, with a larger window available on the chat page. Go and talk about stupid shit. GO FAGGORTS.
I'm thinking of implementing a request interface to help archive threads. /tg/ is a relatively slow-moving board, so it should be easy for a manual request interface (which is how it'll have to remain for the moment): you enter the number of the desired thread, and I'll snag it at some point for archival. Hopefully that will further improve the utility of this site.