Inconsolata is a really good fixed-width font. I'm now using it for both Terminal.app and TextMate. I've also pimped Terminal.app with some SIMBL hacks. Blurminal is one of the very few cases where transparencies are useful in a desktop environment (usually they are reserved for Slashdot reading Linux kiddies who think usability is increased by adding works of H.R.Giger to every window frame).

terminal_pimped.png