Robert Saint John has just posted a masterful piece of work. In it he compares all the different iterations of the Fantasy Trip based systems from Melee to Dragons of the Underearth, to Legends of the Ancient World to my own wee game Heroes & Other Worlds. It is an excellent resource looking at a complete history of the system and a comparison of the different versions spawned by a very sensible and simple game system. Better yet, it includes URL links to the various systems or sites so if you see something you like, you can link right to it! This is quite a great piece of work and I highly recommend it!
Note GURPS is not on here as it went its own way, but you may or may not, find that an omission.