if you get the math in Norvig/Russell's AI text, and the 2 leading Natural Language processing texts (Jurafsky/Martin and Manning/Schuetze) you'll be golden.

Hot off press , 3 week old http://www.cs.colorado.edu/~martin/slp2.html

even hotter http://www-csli.stanford.edu/~hinrich/information-retrieval-...

data mining: there's a few good books, look at Amazon reviews (Han/Kamber, Witten/Frank, the one i have:

and a pretty accessible / non-dense intro, Programming collective intelligence http://oreilly.com/catalog/9780596529321/