Martial Power
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A book released by Wizards of the Coast that expanded on the martial classes (Fighter, Rogue, Ranger, and Warlord) in Fourth Edition Dungeons and Dragons. It has new abilities for each class up to level 30 as well as feats for each class and new paragon paths and epic destinies.
Oh, and before you ask: /tg/ generally considers the book to be good and worth buying (well, since you are a 4efag anyway).
New Class Builds
Fighter
Battlerager -A Pseudo-Barbarian
Tempest -For those who feel the need to dual-wield and wear heavy armor
Ranger
Beastmaster -For those who love their animal companions entirely too much
Rogue
Aerialist -Acrobats with knives
Cutthroat -Moar stabbing less lockpicking
Warlord
Bravura -For the Warlord who wants to be a Fighter ever so badly
Resourceful -For a more 'just as planned' Warlord