For tournaments: HOH1 and HOH2.

For limit: Theory of Poker and Small Stakes Hold'em

For no limit: . . . there isn't much worth a damn.

Super System isn't that good

All books from any professional pro player named Phil suck.

Don't get ANY books that proclaim to help you at online poker. They all suck something fierce.

The Roy Rounder e-book was kinda interesting (and actually about nl).