I have seen complaints by some people (in blogs, etc.) about the size of the standard AIM client. I don't have any problem with this myself, and I really doubt that the people who complain are doing so because their systems don't have enough memory to run the standard AIM. I think it's more a matter of principle for these people: they'd like a simple task to be performed (instant messaging), so they'd like to be able to run a small application to accomplish that.
Enter AIM Lite, Version 0.31 of which was released earlier this month. AIM Lite is beta software, and you won't find it at present on the AIM.com site. While AIM Lite may not satisfy everyone who wants a lighter IM client, from poking around the Internet it's clear that it already has an enthusiastic following.

Recent comments
1 week 1 day ago
1 week 2 days ago
2 weeks 2 days ago
3 weeks 2 days ago
9 weeks 2 days ago
10 weeks 4 days ago
11 weeks 6 days ago
14 weeks 23 hours ago
14 weeks 6 days ago
15 weeks 2 days ago