My guesses so far on a few:
Waters - xNTJ
Gilmour - xNFx
Barrett - xSFP
Gilmour I want to type SFP due to the skills on guitar, but there is something really NF about him in interviews.
I don't mind Sim's typing of ENTJ for Waters. I can see a few things that are very ENTJ in the interview Sture linked.
Barrett reminds me of Paul McCartney a little in interviews (though it might just be that he looks like him ). He is more out there in his music, maybe ISFP.