Wooden reamers were mentioned just above but I like those WS presses
that push the citrus inside out, squeezing all the juice out and keeping the seeds in. There's a small green one for limes, a medium yellow one for lemons, a big orange one for ... um, I forget. smileys/smile.gif I use them all the time.
And I'd add a GOOD swivel peeler, like the OXO one.