Committed to using a web based IM client (chat history included) - instead of using a messaging client. And so far - I dont think Ill be going back... (more and more services should be moving to web based services/apps)
BENEFITS:
-no installed app on my pc
-does many chat clients
-able to record chat history
CONS:
-indication of new chat message is not super clear, but you do get a sound, and it does have an optional plugin for firefox to aid in this