These tutorials are based on my experience with Arbor's Image Magick
Identify	Sepia Toning
Grottos	Transparent Effects
Open Up Shadows	Color 2 Monochrome
Darken Part of an Image	Colors of Light
Getting Coordinates at IM	Coming
Coming	Flo's IM Tutes Index
Tricks of the Trade from IANG members. Midi playing is "Hama" by Claude Ciari