 Transom wedges
Tabman - With your permission...
tseel - NO! Wedges can be helpful for some situations like: In calm water at 4,000 rpms w/ my motor trimmed all the way under my boat porpoises - in a light chop it's unbearable. At WOT I can barely trim out at all w/o porpoising and my holeshot sucks - bow pointing high in the air.
Those problems basically indicate not enough transom angle in boat design, or a riser in the hull planing surface (opposite of a hook). Trim tabs can also correct these problems and usually are much more effective - wedges won't do anything at all to keep the bow down in rough water, and obviously they won't allow you to level the boat out under varying load conditions.
Really negative trim does a very poor job of holding the bow down (not matter how much you have due to wedges and/or transom design) cause the motor isn't designed to do that - it's designed to hold the bow up! Trim tabs allow you to experiment w/ lots of different set-ups and planing configurations.
When I get my little 19' in really rough conditions I find that putting my oversized tabs (Bennett M120's) 2/3 down and trimming the outboard up to just past neutral gives the best ride. It's a combination that just seems to lift the whole boat out of the waves w/o going nose high and porpoising. I don't go fast - but I do go comfortably, and that's a combination you can't get w/o tabs. | 
