It's called http://gw2codex.com/ and it's set out pretty well and very functional.
It's not particularly useful for sorting highly rated builds as for some reason it wont list them by rating in ascending/descending order but I'd assume in future they'll add different filters so you can find what you're looking for easier. Essentially looks like it could be the PVX for guild wars 2 if they build it out right and as of now it's really useful for messing with builds and browsing some top rated ones to see what everyone else is thinking about.
Just a random build I selected to show what sharing builds made there looks like. I guess in future they could add trait information and secondary weapon set to this image too.
All in all a useful little tool but the site is in the early stages so don't pay too much attention to ratings or anything since builds aren't vetted or tested (hopefully in the future though.)
Even if it fades into obscurity it's a nice tool to prepare for the next beta.