I've promised myself that I'd re-watch Fringe all at once. I really liked the show, but I admit I got lost a bunch of times along the way with the season breaks etc. I think it would make a lot more sense if watched all at once. I remember frequenting the IMDb boards, etc. and people would remember important clues from seasons before that I'd forgotten. Also, make sure to keep an eye out for Meghan Markle, soon to be the Duchess of Clarence or some such thing. She had an arc for 2-3 episodes as an FBI agent.