Using the GIMP to Create Images for the Web – lots of great tips here, removing red-eye, getting rid of smudges, logos, etc.
Oh a side note, “convert” from the Image Magik package is invaluable. I have high-quality png files at work which I wanted to edit here at home but they’re too big to download in a reasonable time over a modem link. Simple solution: “convert picture1.png picture1.jpg” and then mail the uuencoded pic home with “uuencode picture1.jpg picture1.jpg | mail donnchaSPAM@linux.ie” (remove SPAM for correct address). woohoo!