Babble's Nicole Feliciano recently put five popular brands of sippy cups to the test, and the brand that came out of top—beating out better known brands Playtex and Gerber—is the candy-colored Nuby.
Feliciano likes that the Nuby has no valves or straws, and frankly, I do, too. Washing crusty sippy cups is one of those crap duties of parenting that no one ever tells you about.
Personally, I'm a fan of the Evenflo insulated straw cups, they don't seem to get as grungy, and they hold enough liquid to quench a thirsty preschooler's thirst. What about you? Got any sippies you'd to recommend?