Just to add to what CG IT has said, 3.0 SP1 is available and is very easy to manage. That being said, the answer your question about for more information is here:
http://technet2.microsoft.com/windowsserver/en/library/d446d310-413f-4844-8aad-c557712397401033.mspx?mfr=true
If you want to force an update detection on a client PC, open a command prompt and type: "wuauclt.exe /detectnow" without the quotes. Then look at WindowsUpdate.txt in the Windows directory for any errors.
Also, what is leading folks to think they are not getting these updates? Is it for a specific application, Windows XP, Office 2003, Live Toolbar, etc., because you can specify which products to update with WSUS. As a final check, if the outside consultant didn't disable it, go to the Microsoft Update website, not Windows Update, and have it check for updates. If it finds critical updates that need to be installed it means one of two things, WSUS isn't working correctly or WSUS is not updating those applications.
If you want to upgrade to WSUS 3.0 SP1 the link is here. You can use the above link to look at the install information. If you do upgrade, here are some considerations. It will require you to uninstall WSUS 2.0, which it will do automatically during the install process. If the outside consultant used group policy to assign PCs into groups, you will need to re-create those groups in WSUS 3. The install isn't very difficult overall. Here is the link:
http://www.microsoft.com/downloads/details.aspx?FamilyId=F87B4C5E-4161-48AF-9FF8-A96993C688DF&displaylang=en