I just found out about IMified, a new service convert IM messages into notes, todos, reminders even blog posts.
First, you have to add the IMified bots in MSN, AIM, Yahoo(currently down) or Jabber.
Then, say anything to the bot and it will lead you though everything. :monk:

A screencast of how IMified works
Some times the Revver server have problems so you might want to directly check out the video instead of the one here. Just refresh some times and it should come out right.

SNIMMR(Single Network Instant Messaging Mediation and Relay) is a web IM service can allow chatting with user of MSN, AIM, ICQ and Yahoo Messenger. What SNIMMR differents from Meebo and other web IM's is it does not need your IM password.

SNIMMER will connect you quickly and privately, accross all networks and will let you chat via Web IM and freely browse the web at the same time. If, on the other hand, you wish to see your buddy list online (just like you do with a regular instant messenger), then SNIMMER, by its design, will not access your private IM account information.

As the site said, it can't replace meebo and other web IM's because it is more like a chat system allows you to chat with anyone on any IM.

Editor Comment:

SNIMMR have a service that allows anyone to add it on your webpage so user is able to chat with you. Gabbly might be a better choice if you think most users does not use IM to chat with you.