As people start submitting their favorite resource links I'll add them here. In the meantime, here are a few of my own favorites:

Light Impressions offers the world's largest variety of fine archival storage, display and presentation materials for your negatives, transparencies, CD's, photographs, artwork and documents.

Bruce Beard's Hair and Skin Color charts

Although I've no idea what earthly use it is, I've posted the histograms to illustrate what happens when you convert from AdobeRGB colorspace to sRGB

Deke McClelland's indispensable Photoshop Shortcuts list (up to v5, anyway)

Wilhelm Imaging Research for more than you could ever want to know about the image permanence of various inkjets

inkjetart.com is a good place to buy some of the stuff Wilhelm reports on, and lots of good inkjet advice, as well

Inside Photoshop Magazine is good for general tips and tricks

PEI is my own personal favorite photo magazine