I like my Sekonic Twinmate handheld reflective meter. I try to use it with the zone system, although a spot meter would be more accurate. The Twinmate is handy because you can also switch to incident light (where the situation permits) to check how accurate your zone compensation is. I also just take a few ballpark readings (sun, shade, sky, ground, etc.) and only meter when the light has changed significantly. Of course, this method is less successful with colour film but then reflective meters are not that much better than guesstimates anyway...
Anyone know of a good, handy handheld meter with a spot attachment? That would offer the ideal amount of flexibility and accuracy for most situations, I should think.