I am going to highlight a few here in this post.
The How to find end users thread at Namepros started in 2005 and has over 2450 posts. This is a good thread to get acquainted with for those new to the business of buying and selling domains. Its a big thread that will take some time to get into and there are certainly some posts where people are self promoting. Overall its worth reading for those interested in finding end users.
A newer thread is one started by Namepros member Smurge, it is about parking domains and earning more. Smurge details some techniques he uses and the thread has become very popular.
Long before any domain bloggers were blogging about numeric domains, Namepros member Paxton put together the Numb3rs thread on Namepros. The thread was started in 2005 and has over 190 posts.