Konfabulator for free
I tried out Konfabulator a while ago, and I liked it, but not enough that I wanted to spend money on a license, and now I don't have to, since Yahoo! just bought them and decided it should be a freebie.
I never really liked how Dashboard take over the screen when you use it, at least not for things like the weather widget. Clocks, monitors and other little info widgets should be constantly visible along the edges of the screen and not have to be summoned to be seen, and Konfabulator delivers.