Microsoft Update Catalog
I have to say kudos to Microsoft on the great work on this new tool. The Microsoft Update Catalog is a search engine for Microsoft updates. Unfortunately it's late, so no pretty screen shots... and I wasn't too happy about the fact that IE is required but it does use ActiveX. It's designed to work like a shopping cart application. You can add the updates to your basket and download them in one lump sum.
Example Searches:
"internet explorer" +"security updates" +"windows xp" [Returns all Security Updates for IE on Windows XP]
The + seems to be irrelevant however, as there is no negative logic... which would be a nice addition. Because of the lack of negative logic, the search:
"internet explorer" +"security updates" +"windows xp" -"x64" will return only x64 updates.
You can also search by KB Number, MS Advisory and Hardware
All in all it's a pretty cool concept... I'd just like to see the search engine improved slightly.