Ok, I'm going to ask a build question so try not to get too worked up. I have done all the required reading BTW.
My rogue is level 31 on a PvP server, so I consider myself to still be a noob with the class and with PvP. I have mainly focussed on leveling and have only played some BGs (although I ramping up so I can acquire some better gear). I've put most of points into Combat as most people have suggested and am not having any problems leveling, aside from the odd ganking :) However, I've noticed that many of my guildmates are putting early points into Subtlety instead (I call them the Ghostly Strike fans). None have given me any great reason for it yet (I won't rule out it being a case of follow-the-leader) but all seem to happy with it.
I'm just wondering if anyone can comment on the merits of the Subtlety builds for leveling and BGs (as compared to Combat Swords). I'm tempted to try the build myself to see if it helps me in PvP but I thought I would ask first.