This is a fantastic, in-depth look at Apple's OS X 10.3 (Panther).
The most interesting bits to me were...
- packaging/marketing of 10.1 v. 10.2 v. 10.3
- the mini-widget set
- the brushed-metal usage guidelines
- nested tab-area views
- OS upgrades make the system faster*
- the history of window management
- hitting tab while in expose-mode
* - really fascinating, this bit was. Especially in light of my recent hardware inadequacies. In the world of Windows and Linux, we've come to expect a performance hit with each new version if the hardware stayed the same. That OS X has turned that around completely is something that I quite simply took for granted.