I'm a big fan of BaseCamp -- an online project management tool. BaseCamp also gives you WriteBoards, which are roughly analogous to shared, online MS Word Documents.

http://yuml.me is less than a month old, and traffic has settled around 1000 visits a day. Users out there have generated well over 31,000 UML diagrams so far, wow!

There's something beautifully creative about sketches. I've blogged about it before:

• Elite Game Artwork Scans

View Diagrams on GitHub

I messed about with putting yUML diagrams on a GitHub gist, I think they work well with the GitHub style.

I thought it would be fun to have a scruffy hand drawn look for yUML diagrams, which I'm really fond of.

I love the rough sketchy look when it comes to idea sketches, GUI wireframes and paper prototypes.

Deeplinking blogged about these incredibly cool initial design sketches for things like Twitter, Flickr and AbiWord.

Wow, these are insprational (in a back of fag packet kind of way) - scans of notes and artwork by Ian Bells - the creator of the original Elite game.