I've been blindly using GAIM for quite a while now and I was completely unaware of the issues detailed in this post on OS News.com. What's worse is that I have been recommending it and I know a LOT of people have taken it up on my recommendation. Especially on Windows.
While this problem applies to both Windows and Linux, it is worse on Windows. I think I shall quit using GAIM on Windows, but continue to do so on Linux. The post puts things in what I think is a clear perspective and I recommend it. It also has the advantage of being short and to the point, with links to further information.