Update: 5/11/2011: http://myitforum.com/cs2/blogs/skeiffer/archive/2011/05/11/dell-warranty-info.aspx
Chris Duszenski noticed that for his environment, the Dell Warranty Script (part of the script + mof edit method for having individual computers report on their Dell Warrenty Information), was not longer successfully returning data.
He modified the script to reflect those changes, see attached.
We thought that might happen--it is a vendor web site and of course Dell can change their web site at any time or remove the web location completely at their discretion. If you happen to be using the Dell Warranty Information script + mof edit, you might want to update your .vbs script. Naturally, with all of the appropriate testing and pilot precautions. I haven't tested this myself yet.