Hmm.. FTL loopholes...
Well, there is one possible way to go FTL that fits perfectly with modern physics from what I've read, if we knew how to do it.
When a photon of light travels, it virtually splits into a electron and positiron, or some other simaler particle pair, which then annihlate each other reforming the original photon.This is the reason light travels at the speed it does, because of the virtual particles slowign it down. Now one effect that has been observed(it was covered in an Alternate View by Dr John G Cramer in Analog.. don't remember the issue offhand but it was late 80s or early 90s I belive) is termed teh casmir effect. The idea is to put two plates close enough together, it impedes the formation of the virtual particles, as their path would cause them to hit the plates. Since the photon spends less time as virtual particles, any light travelling through there actually speeds up a minute amount! Thus in this small area, the speed of light is raised by a minute amount. If the plates were uniformally smooth(as in perhaps cosmic string or cosmic walls) and placed close enough together, you might could get significant increases in speed. Now comes the sci-fi part: create a field that surpresses virtual particle formation in the same manner. Now place a ship within it, and set the field to move wiht the ship. Voila! FTL drive! The ship can accellerate to large velocities within the bubble, and while to the universe outside the bubble it'd be FTL, the ship technically never breaks the lightspeed barrier!
Then of course, there's also the idea that a loop around a cosmic string totals less than 360 degrees... I'm sure there's somethign someone can do with that. (And didn't Vonda McIntyre write a series of books about that idea actually? o.O)