Here is a great story added to the main swtor site. It basically gives some backstory to the events going on in star wars the old republic.
It about a few jedis that where corrupted by the force and a story of how long the sith have been spending time behind the lines to prepare their attack on the jedi. Its a good read and work your time to check it out.
Read more here http://www.swtor.com/news/news-article/20100416_001
For a direct link to the video check here http://www.swtor.com/news/news-article/20100416_001
Tags: jedi, republic, sith, star wars, swtor, The Old Republic, timeline