One thing I pay for and I don't think anyone mentioned is "O'Reilly Safari Bookstore". US$ 22,00 month (I think?) and quite some nice books: the Javascript Rhin

One thing I pay for and I don't think anyone mentioned is "O'Reilly Safari Bookstore". US$ 22,00 month (I think?) and quite some nice books: the Javascript Rhino book, Obie's the Rails way, the Ruby way, the Pragmatic Programmer, the Cathedral and the Bazaar, and Hackers & Painters, to name a few.