This site categorizes all of the MS Security Bulletins as follows:

Date
Bulletin Description and Exploit
Affected Software Service Packs
Bulletin Rating

This site also provides links to sample exploits. If one is not available or know, they provide a link so that you can point them to one that is known to work against unpatched hosts.

I find the site very useful for information & testing and also to guage the skills of some of the exploit writers out there.

I know the potential misuse that can occur from posting the site but I believe the benefits to security practitioners is far greater.

http://elsenot.com/

--TH13