Glowing Pickle http://isaac.exploratorium.edu/~pauld/activities/aaptelectric/glowingpickle.html
Two enhancements to the standard demonstration apparatus: using a ground fault interrupt (GFI) to reduce the risk of electrocuting the demonstrator, and using potassium chloride (a dietary salt substitute) to produce a pink glow rather than the traditional sodium yellow. Also discusses the mechanism of the single-ended glow.
Lori's Chemistry Page http://www.geocities.com/CapeCanaveral/Launchpad/6603/glowing.html
Discussion of various wavelengths of light, comparison of the colors of potassium, sodium, and lithium flames, and QuickTime movie of a demonstration of these concepts, by a high school chemistry teacher. Also has instructions on how to make a glowing pickle.