Microsoft reaches into its deep pockets to offer cash back on its comparison shopping site. A challenge to Google?

Steve Baldwin has a nice post about it over at Mediapost, with some thoughts about whether or not it moves us closer to the CPA (cost per action) holy grail.  I wanted to check this out for myself, even willing to sign up for the service by giving the Empire my name, but when I went to search.live.com and tried to click on the Cash Back image link, I got an error message.  On the actual Microsoft site.  Isn’t that perfect?