+1 for more than five swatches.
More importantly, I would want this to be done intelligently. I'm not super-knowledgable with color theory and typically build color schemes off a 'parent palette' - typically using shades. I wonder if you could produce auto-generated 'child palettes' built off a parent scheme - using the same rules (analogous, monochromatic, shades, etc..)
Also...
+1 for color collaboration. I love what the Flat UI team created with their color picker - Flat UI Colors. It would be awesome to create and share more comprehensive palettes with your team.