See Rep theory folder
http://mathoverflow.net/questions/2755/a-learning-roadmap-for-representation-theory
http://nlab.mathforge.org/nlab/show/representation+theory
[arXiv:0912.0569] Lectures on geometric constructions of the irreducible representations of GL_n
Old list of books on rep th and algebraic groups:
las conrad o rubin!!!
Lie Groups and Automorphic Forms (AMS/IP Studies in Advanced Mathematics) (Paperback)
Serre: Linear reps of finite groups
Knapp
Fulton and Harris
Borel: linear algebraic groups Jantzen: Reps of alg groups, 2nd ed
Humphreys: Intro to Lie groups and algebraic groups
Humpreys: Linear algebraic groups
humphreys: Intro to Lie algs and rep th
Serre: algebraic groups and class fields
nLab page on Representation theory