On this youtube channel theres a great set of datacron guides, they have a full set of Republic ones and a growing set of Empire ones, just thought I'd share the link as I've found them very helpful
http://www.youtube.com/user/GameCannonAdmin
http://www.youtube.com/user/GameCannonAdmin?feature=mhee
We've been producing some datacron guides over at http://www.gamecannon.co.uk so I thought I'd share the link here as they may help people out