Etingof et al. 
Introduction to Representation Theory (Student Mathematical Library)
Which has a version online in [Pavel's webpage][1]

This book actually came to be from a class that Etingof gave a strong group of undergraduates I think in the SPURS program, most of them where from the Olympiads. 




[1]:http://www-math.mit.edu/~etingof/replect.pdf