I gotta hand it to the Xobni marketing folks. Nothing super new in the scarcity marketing book, but they've added a clever technique. In order to get "priority" access to their beta, you can 1) invite other folks to sign up; 2) appeal to them directly; 3) put a xobni badge on your blog or website. #s 1 and 2 aren't particularly new, but I've never seen the badge thing before. Nice work!
Oh, and yes, there is a sycophantic element to this blog!