Here is the latest in my link-listing series. Also check out my ASP.NET Tips, Tricks and Tutorials page for links to popular articles I've done myself in the past.
Several people have pinged me asking for the download location of the ASP.NET 3.5 Extensions Preview. We were hoping to post it on the web Friday, but unfortunately found a late bug that we felt needed to be fixed. The team is working this weekend to sign off on the new build. We hope to be able to post it as soon as this is done - apologies for the delay.
LINQ to Active Directory is Here: Bart De Smet from my team has been working on a cool LINQ to Active Directory provider (previously called LINQ to LDAP) in his spare time. You can learn how to use it in his series here, as well as read about how he built it (and learn a lot about how to build LINQ providers).
Hope this helps,