Gtlak and AIM are now integrated (announced 2 years Ago when Google took 5% of AOL). but No one has caught the detail yet: in addition to your AIM buddy list you can now include your ICQ buddy list within Google Talk within Gmail.
I am not surprised this detail has not been noticed in the US where ICQ is not so popular compared to AIM. ICQ is pretty popular in some european countries (Russia,Germany, ..). As an ex-ICQ executive i wanted to know if the integration with Gmail was complete
AIM and ICQ are fully compatible (same house) and i logged in this am with my ICQ credentials within Gmail (even if this is indicated within the login window where your AIM credentials are asked) and it worked perfectly
Now you can chat from Gmail with AIM and ICQ.
ICQ is lacking a good web based solution for its IM. There is one but it is not good. Now there is a good one. It is called Gmail (you can also use Meebo or eBuddy but why bother)