What I like about this is the synergy between the PC based and mobile based sites. With a single sign-on for the user it can only help to promote the idea that a website on your computer is also available on your phone – something that the uber-geeks already using the high end X-Series phones from 3 (and others) will be aware of, but that knowledge needs to get into the conscious of the regular users.
It’s at an early stage, with only a handful of software titles (and user reviews of said software) and mobile websites listed, but as more people register and populate the database, this could well be a good mobile portal. Kudos to Three for allowing anyone to use the site, and not just users of their service. They’ve come a long way from their initial walled garden of data!