Looking for a good summary of information on the Global Assembly Cache (GAC)? Jeremiah Talkar has updated his article on The Code Project:
Demystifying the .NET Global Assembly Cache - Good roundup of info, including various APIs for interacting with the GAC, what it contains, and what you can do with it. [from Mike Gunderloy's Larkware News]
If you spend any time with .Net Security and/or Enterprise Services, you should look at this article as both technologies require some knowledge and understanding of the GAC.