graphics
Spiral Betty
Turn an image into a spiral. I saw this put to good effect using a vinyl cutter and t-shirt.
The Cicada Principle and Why It Matters to Web Designers » HTML & CSS, Layout » Design Festival
A bit mind-bending but so clever!
webkit2png
Great command-line utility for screenshotting.
Photo editor online / free image editing direct in your browser – Pixlr.com
This editor is nice because it does all the standard things to images, but also lets you start from scratch and use layers.
Raphaël—JavaScript Library
Pretty sweet vector graphics, and I like the Flash-style charts.
PNG8 – The Clear Winner
Yay, Fireworks! Yay, PNG8!