I finally watched Razor last weekend. I didn't know the new season started this week until today.
If you need a refresher course, here is about 40 hours (30? I don't know) compressed down to 8 minutes. They actually do a pretty good job of covering the story.
http://www.scifi.com/battlestar/index.php?clip=recap
(It was working this morning, it isn't working for me right now)