I've written a bunch of perl scripts that have been spidering every site on froogle selling e6600s. It's been hitting each site in turn, continually looking for signs that something was in stock and then it'd send me and some other people SMS messages alerting of the status. Much better than reloading the browser or waiting for an auto-notify email to go through. Plus I've known within 45 seconds if anyone of the many merchants were in stock. :-D