Good color palette, usable for the color blind.
If you want to go with "trial and error" approach, I'd suggest a tool named Color Oracle (cross-platform) which simulates deuteranopia/deuteranomaly, protanopia/protanomaly and tritanopia -types of color blindness on your computer screen.
(Also Photoshop has color blindness proof setups available under
Proof Setup (CS5 has, at least). But Photoshop might be a bit overkill, if you're about to design a chart.)