http://www.giantbomb.com/ has just updated their achievement tracking services for PS3 trophies. Anyone who wants their PS3 trophies stacked up and compared should login or sign up and go to their userpage. From there go to the Achivements tab and then...
to the Manage Accounts button. The rest should be obvious.
I'm glad they finally implemented this. Now with a place to keep all my achievements together, I don't feel like my PS3 trophies are going to waste compared to my immensely larger 360 collection.
Seeing all of your achievements together on one big chart is actually kind of thrilling.
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I'd have to assume Sony has given them access to their database.