Tracking Windows servers configuration!

Hi there,

I am sure lots of us must have plenty of windows servers, than comes the need how to document the complete configuration of Windows server and the application which are running on those servers.
I was wondering how does you guys are doing out there. Of course there are fancy software but there should some of you must have home made recipe to keep good track of the changes of the servers. I will be glad if some of you would like to share how tackle this problem.

Shashi