Sketch This - Daily drawing challenges
Stickman Builder - Free parametric graphic Stickman Builder, creates fascinating stick figures on the fly.
The Bored Hoard - Sieve the web for cool websites you probably never knew existed. Supporting the smaller independent sites that Google ignores. All revealed in a weekly box delivered online every Friday.
Iceberger - Draw an iceberg and see how it will float
Cycloid Drawing Machine - A mesmerising spirograph-like web app
Clipnote Studio - PC alternative to Nintendo's now defunct animation software, Flipnote studio