I've looked for this a few times in the past, to no avail. I would like a simple php/ajax web chat interface, that, and this is the critical part, will interface with my IM client (Pidgin) ... via Jabber or Aim. Plugoo is almost what I want, except it is hosted, and flash based. Flash-based would be OK if not ideal, but hosted isn't.
Note that I don't just need notifications, but I want a user of the website who clicks "live chat" to get a chat interface and my IM client allows me to interact with them.
This is super handy for those of us that want to provide live support to clients who do not use IM.