AP called it: Rodriguez defeats Bonilla in TX-23. I'm genuinely surprised about this one, although I don't know how much you can read into low-interest runoff elections held in mid-December.
But every seat Democrats win in 2006 will be easier to win again in 2008, because of the advantage incumbency provides. Congratulations are in order for Rodriguez, particularly after his quixotic, doomed primary battle against Henry Cuellar earlier this year.
UPDATE: reactions here, here, here, and here.