@Rob-Dunn said:

You should check out the following regarding GPO settings:
http://community.spiceworks.com/how_to/show/1390-wsus-gpo-settings-for-the-real-world

With regards to why your computers aren't checking in...well, I have a how-to for that as well!
http://community.spiceworks.com/how_to/show/91430-wsus-computers-are-not-showing-up-in-the-console-what-s-wrong

Thanks Rob. I'll check those out tomorrow!