I personally used Gelfand's book to learn all the algebra I needed to know:

http://www.amazon.com/Algebra-I-M-Ge...1516690&sr=8-1
I liked it because it is concise, yet the exercises were challenging.

This is the book we used in our Algebra 2 class years ago:

http://www.amazon.com/Algebra-Trigon...1516703&sr=8-1
It's O.K., the trigonometry section is a bit lacking IMO, but there are alot of routine drill problems to practice algebra skills.