The Best Sources
Becker, Becker, Schwarz, String Theory and M-theory has a wide scope (from classical bosonic strings to BFSS Matrix theory (and a bit of Matrix string theory), and a bit about F-theory) and discusses the topics very intuitively. I've not read GSW, but I've heard that BBS is a modification to that (old) book. Can be downloaded from http://www.gen.lib.rus.ec (not a pirate).
McMahon String Theory Demystified has a rather wide scope but relatively less depth. Could once be downloaded from a pirate site, which no longer exists.
Mohaupt Introduction to String Theory has a limited scope and depth, but covers the gravitational implications of string theory rather deeply. Can be downloaded here: http://arxiv.org/abs/hep-th/0207249v1.pdf
Kaku Strings, Conformal fields, and M-theory is an extremely rigorous, rather unintuitive, rather wide and deep, source for learning string theory.
Two More Sources
For String Field Theory
I am planning to read this lecture notes with a supposedly better (PDF only, no abstract page) version here.
Oh, and by the way, you may also be interested in this still-under-construction wiki I've started recently.
Also, these lectures by Shiraz Minwala were suggested by Larry Harson in the comments.