My third MSDN magazine article, Digging into IDisposable, appeared in this month's issue in the CLR Inside Out Column. It's a bit of a departure from my usual security fare; this time looking at how to best handle writing class libraries that must manage resources.
Also in this month's issue, Kenny Kerr provides a good introduction to the new CNG APIs available on Vista. Especially interesting is the code snippets he provides translating from CNG RSA keys to RSAParameters for use with RSACryptoServiceProvider. (And for a quick rundown of the managed CNG classes Kenny mentions in the v3.5 framework, you can see the posts in my CNG category).