Proving the whole 6 degrees of separation thing, I finally received an invitation to Orkut. The thing that struck me was when highlighting a button I noticed this in the status bar:
javascript:__doPostBack('btnUpload','');
Ah, now doesn't that look familiar. I looked up and noticed I was on the http://www.orkut.com/SignUpPhoto.aspx page. Definitery an ASP.NET page. Cool.