I shoot medium format film (both landscapes and in the studio) so I do use a lightmeter.
I either use my D300 as a lightmeter if I'm carrying it with me, or use a Sekonic L-758D. You probably don't need anything as fancy as the 758 (I don't either, just I got a great deal on it).
Looking to pick up a tiny tiny hot shoe mounting lightmeter as well though, to use on my Yashica TLR when doing street photography. That said, I do most of my street photography on black and white, and I can normally guess exposure to within 3 stops anyway.