I voted "Good idea, but unnecessary." It would take up a lot of space, and kind of invalidate Savage Species to include that info in all future monster supplements. Just an entry for Level Adjustment (or ECL) would be enough to make creating a class pretty easy.
I would appreciate having some monsters with default "treasure" though. That CR 5 Troll should have somewhere between 800 and 2000 gp (roughly) worth of stuff. That's definitely enough for a masterwork weapon, and maybe magic armor and potions. That way, instead of rolling for treasure every time, a DM can simply use the default. Of course, it wouldn't preclude random treasure generation, but that's rule 0 territory anyways.