Theif D/D build
Check out Yishis vids, his vids tend to grow some hair on bad and new thieves chests.
https://www.youtube.com/watch?v=b8Lh8Oogl6Y
https://www.youtube.com/watch?v=NEEYhovtwBo
The base is pretty much 30CS and 30SA, with 10 points wherever you desire.
2.4k armor and 15k vit sets you up good defensively without losing too much damage.
Good place to start.
In spvp, I wouldn’t recommend D/D, and instead D/P.
http://gw2skills.net/editor/?vYAQNAoaVlsMp7pVOx0J8PNhs9oC3Jey7BZNWmlWBaC-TsAg0CnIQShkDJDSSksINKYBxkCA
Not bothering finding good vids, but Caed might have some nice highlights.
http://www.twitch.tv/narcarsis
Thief, Engineer, Mesmer – Seafarer’s Rest (EU)