I'm so new I haven't even installed it yet. But I am psyched!! I should really be going to bed, but I am so psyched to try it, first I saw that it works cross platform (Windows Mac and Linux) which made me very interested, seeing as I use all 3. Then I saw it was free, which made me happy, then I saw the forums with all the peoples. Also I want to be part of somthing before it gets big. But this seems to be growing fast.. Any tips before I start? 
Cheers