Sony has added a Trophy viewer to PlayStation.com, as announced on the PlayStation Blog yesterday.
The page gives you all the information you can find on your PS3: your level, percentage to the next level, your totals for bronze, silver, gold and platinum trophies, breakdowns by game, and full trophy lists for every game you have.
In the future, Sony intends to add new features allowing you "to compare and sort trophies in new ways".
The system only seems to be live on the US PlayStation.com website at the moment, but we managed to log into it fine to check it out nonetheless. Simply log in with your PSN details, click on "my profile" in the top right of the page, and then click on the "Trophies" button.