1. At the top of the list obviously, the loose passive player

2. Next the maniac; if he's catching, he can be a problem, but if he doubles or triples up, the game can be good all night.

3. This is the important type, as many players on this board who wonder why they don't win more, or even emerge as slight losers might fall into this category. The tight/passive/passive player.

This player voluntarily puts money into the pot pre flop less than 20% of the time. He raise less than 5% (usually around 2%) preflop. He is decidedly unaggressive post flop. He constantly wonders what his oppponents have, thus sees monsters, and never seems to win what he thinks the should.