Its always neat when you find a gem of an article. This time is on Paged and NonPaged memory. Very good article on what the limits are, what you can do, and how to find memory leaks.
I know that memory leaks wind up being the cause of a lot of issues out there, usually because someone did somehting silly when coding, and that it can be a pain to track it down. Hopefully that article will help give you ideas at the least, on how to find the culprit.