Free specialization manuals glitch
FInd a vendor that has the manual you want and then save your game. Buy the manual to unlock the specialization and reload your save. It will still be unlocked, you will have your money back, and the manual will also be missing from the merchants inventory. *Note: this glitch has not been fixed as of 11/17/09.

Embark on an inspiring mission of human connection beyond the UCA. Sam — with companions by his side — sets out on a new journey to save humanity from extinction. Join them as they traverse a world beset by otherworldly enemies, obstacles and a haunting question: should we have connected?