From the publisher (Alluria Publishing):
Go beyond the classic! The Clever Classes books present new class options for players of 4E, bringing iconic characters with exciting new abilities to the gaming table. These PDF books come fully illustrated and are completely compatible with Dungeons and Dragons 4E.
Each new class comes complete with new powers, paragon paths, epic destinies, feats, magic items, and backgrounds, allowing them to fit seamlessly into any campaign. Whether you are a player looking for an exciting new concept, or a DM seeking a devious new NPC, Clever Classes will provide both in spades!