I was looking at the Microsoft Dynamics CRM Resource Center (RC) and found this rather nice list of available downloads for your consideration. The RC is full of interesting articles and is updated often. I have found that by cherry-picking the add-ons that I value I get a lot more from my software. And many times I get the "Ah ha" moment from friends who are looking over my shoulder.
You can find many downloads for Microsoft Dynamics CRM by searching the Microsoft Download Center. Here are a few of our favorites:
Operating and maintaining