Deja Vu * is Bitstream Vera * with Unicode characters. Good if you're not using Emacs and want nice-looking λs in your code. (Emacs has a map from character range -> font, so you can use your own Unicode font along with your favorite ASCII font. But using Deja Vu means you don't have to configure that as much.)

FWIW, I use Deja Vu Sans Mono for coding. It is a nice-looking font, especially when grey on black.