Though I haven't actually read it (yet), I've heard lots of good things about "Investment Valuation: Tools and Techniques for Determining the Value of Any Asset, Second Edition" by Damodaran. [
http://www.amazon.com/exec/obidos/tg...6526?v=glance] I actually think there was a PDF version of this text floating around somewhere on the 2+2 stock market forum a few months ago.