As study of the Steve Hullfish book The Art and Technique of Digital Color Correction continues, more on info color keeps popping up.
Chris and Trish Meyer have sage advice in a new series on color; see On Artbeats.com: Color Theory at PVC.
Also, TUTS+ had a nice roundup in April of Color Tools, Resources and Tutorials for Photoshopers, and (via lisaorgler) Colour Lovers has all kinds of stuff (including British spelling quirks).
There's also a few newish color design websites with nice picker tools:
The Color Scheme Designer is an online color palette picker tool with some nice nooks and crannies. The latest version sports a new interface and engine with better color space conversions and previewing, an enhanced scheme creation system, and unique scheme IDs with a permanent URL of the scheme.
ColoRotate has an intuitive interface that lets you wander in 3D color space to uncover color relationships and choose a color palette that fits your needs.