I like colourlovers.com as well. Feels more organic, less engineered. And those palettes are easier to use, since they are reduced down to a theme, rather than having a 20 color palette with no overarching theme.

That is just me speaking as a non-designer. It's much easier for me to say... go in and find a theme for Cinquo de Mayo in Color Lovers, then try to infer it from these flat palettes.