Been working on WSUS as a work project (second job in a row for it), and I just wanted to spill out a bunch of links about WSUS.

MS WSUS Blog
WSUS Forum
WSUSWiki
WSUS Beginner’s FAQ
Microsoft WSUS newgroup
related scripting site

And if you want to use WSUS but do not have Active Directory (Group Policy) in use, you can still use WSUS with some manual scripting of registry settings.