This helped me a great deal, increased my reading speed for anything non-technical by at least two-fold:

http://www.amazon.com/Evelyn-Seven-Day-Reading-Learning-Prog...

I bought this one recently as well due to reviews on the Evelyn Wood book, but haven't read it yet (Land of Lisp is taking all my spare time):

http://www.amazon.com/Breakthrough-Rapid-Reading-Peter-Kump/...

I tried Adderall for slight ADD for about three weeks when I was an undergrad, and found the initial effect very helpful, but I could feel it degrading even over just two weeks.

That convinced me was an extremely temporary solution at best, so temporary as to not even be worth it.

Later I was walking through Barnes and Nobel and found a book on speed reading in the bargain bin:

http://www.amazon.com/Evelyn-Seven-Day-Reading-Learning-Prog...

Bought it, read it, learned it (somewhat, I still can't read a page a second), and found it improved my focus and concentration (at least on reading and programming) more than anything I'd ever tried, even Adderall.

That may or may not help you, but I'm a believer now.