Slapvid - Does peer-to-peer video streaming in the browser. It's just a proof of concept now and it doesn't bring anything useful to users but it could bring great bandwidth savings to content providers. (Unfortunate name though, is happy slapping just a UK thing?)
Chime.tv - A Joost-like interface to YouTube, Veoh, Google Vids and others that runs in the browser.
OSX vs Vista development methods - The design teams of OSX and Longhorn discuss the design process. Did you know that Apple did NO user testing for OSX? It was nearly all designed by Steve Jobs!
Pioneering a User Experience (UX) Process - Some great tips on integrating user centred design into your company.
Web Application Form Design - A short discussion of the pros and cons of various aspects of form design.
Wikipedia game - And one for after-hours...