In my previous post about using and Dispose[1] I touched lightly on the Garbage Collector. Indeed very lightly, I never mentioned it but Dispose is very much related to the GC.
Today I found Chris Lyon's Weblog which contains excellent info on the GC, ranging from Dispose to WeakReferences. Read the blog, it's just 17 posts but well worth your time!
[1] Using Dispose Close and Connections
[2] Chris Lyon's WebLog