It is only logical to think that Google would by the ww.wgoogle.com variation, just in case someone hit that period key one step to early. In fact, if you take a look at the whois record for WGOOGLE.COM, you will see that the physical address and email address match that of Google's headquarters. So what is the problem?
The main question here is. Google would not be participating in doorway pages. So why would this company register the information using the email address email@example.com? Only Google or a Google employee would have access to this.
Forum discussion at Search Engine Watch, great find Marcia!