Maytag DWC7400AAW
It works quite well, is portable, and has a garbage disposal built into it, so dishes require very little rinsing. The super-heating function ensures that the water gets hot enough to sanitize the dishes in addition to cleaning food off of them -- when it's first finished running, the dishes are almost too hot to touch! The fact that it is portable and on wheels is very handy. It's been with me now through two moves, so I always have a dishwasher whenever I need it.
It has a nice butcher-block style top, which acts as extra counter space. The reason I gave it 4 stars instead of five is because there is a little bit left to be desired about the dishwasher. First of all, it's kind of loud. It's totally worth the noise, but if your kitchen is in earshot of your living room, I wouldn't recommend trying to watch a movie while it's running.
Secondly, there are corners of the top rack that you can't put glasses in or they won't come completely clean -- other stuff will, though, so it's not a super big deal. Also, the aforementioned butcher-block top is kind of a pain to keep in good shape; you have to oil it with mineral oil or it gets drink rings and such.
Overall, though, it's a good dishwasher, and my life is the better for having it around. Well worth the money I paid for it.