Bamboo do a lot of Web Parts and I mean a lot. I’ve used a couple of them and have been really impressed.
Bamboo Labs have just released their latest offering. It is not a web part but a desktop (or server) application called SharePoint Analyzer. It lets you get information about your SharePoint farm.
As it is in Beta it is FREE. I hope it stays free.
Check out http://community.bamboosolutions.com/media/p/7160.aspx for full details.