I received a notice that the LifeCam VX-3000 should arrive today. I ordered the VX-3000 as I don't think that I need the 5MP camera feature, but I may find that I'm wrong.
I have heard a couple of people running into configuration problems related to AV and firewalls. Be sure that you visit the troubleshooting page for the LifeCams, and if you're having trouble, take a look at your firewall settings as outlined in this KB article.
If one of these KBs don't address the problem, please visit the Online Support Page to start an email support incident or call (866) 833-7088; in the States we offer 90 days unlimited support, included at no charge. (Visit the page for contact numbers in regions outside the US.)