Atlassian really tries to document everything in on the www. There are many different locations with usefull information. Below you see a selction of some links that might be usefull for you
Pix Software is "best performing Atlassian partner of 2010"
Pix Software is Atlassian partner since 2003. Al Atlassian's first partner in Europe we have extensive and in-depth knowledge of the Atlassian tools.