Good books/sites on real estate market analysis?

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I am looking for a good book on analyzing markets prior to entering them, but the only one I've found is from 2001:

http://www.amazon.com/exec/obidos/tg/detail/-/0874208688/ref=ord_cart_shr/102-2402159-5392948?%5Fencoding=UTF8&m=ATVPDKIKX0DER&v=glance

Does anyone have a more up-to-date book, or is this the book to buy?

Also, which sites do you guys recommend to analyze and select commercial markets in different areas of the country? Any free ones would be very much appreciated :)

-Jonathan