If you've not yet seen it, the keynote (by Steve Jobs) from the World Wide Developer Conference last week can be viewed at:

http://www.apple.com/quicktime/qtv/wwdc04/

Items talked about include Tiger (OS X 10.4) due next year.

Also, some slide of what Tiger will look like can be viewed at: http://www.eweek.com/article2/0,1759,1619860,00.asp