There are many books about archaeology. It's a very diversified subject but I can still make some suggestions about prehistoric archaeology books:
Steven J. Mithen - The Prehistory of the Mind.
Richard G. Klein - The Dawn of Human Culture.
Robert Braidwood - Prehistoric Man (very old but still the best)...
You can also find some books about archaeology that I personally suggest... The page is unfortunately in Turkish but you still have the chance to get some names of authors.
You can find some e-books about archaeology here:
Also you can find many books at Amazon:
This is the page of About.com's archaeology books:
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