Who is to say who is the lessor of two, three, four, or whatever number of evils? Just because someone is not from one of the two large parties doesn't magically make them a savior.
I'd vote for a third-party, or no-party candidate in a minute if I thought they made sense and if I actually trusted that they would, or could do any of what they said. The problem is that, like it, or not our politics are pretty firmly based on a two party system for all practical purposes. Where part of the problem lies is with the primary system, where some very good candidates are eliminated before they ever get off the ground. I think if all the primaries were held on the same day it would change the dynamics a little and relative newcomers might at least have a fighting chance against those who have large war-chests.
The idea of voting out the incumbents to get change is a very wrong-headed notion, because you can bet that the Dumbycrats aren't going to do that. So it would be an excercise that would guarantee continued Dumbycrat (communist) control.
For 2010, the best we can hope for is that enough people realize how badly we are in the ditch and headed for a concrete abutment and we'd dang well better figure out some way to change direction.