We got these lemon and lime hand juicers as a present. We've used them to make citrus dressings and lemon shandies, and we love them. In fact, we're thinking of buying them for a couple of our friends. They'd make a nice housewarming present or a perfect summertime gift for a hostess. The ones shown at left are available at Crate and Barrel.
Williams Sonoma has a two-in-one version (shown right) for $20, and Sur La Table offers separate juicers for lemons, limes and oranges. While some might prefer the ease of an electric juicer, we like the satisfying squeeze you get from these manual models (and the bright colors are a bonus).