- An upgrade to WPA2 (personal and enterprise).
- Addition of AES encryption support for WPA as well (a feature supported by many access points/home gateways).
- A fix for the problem with the retry button not working when joining non-Apple WEP networks that has irked me for a while.
- Improved reliability connecting to networks after sleeping.
There were also fixes to Mail, iChat and Finder as well as a whole slew of bug fixes across the system. See Apple’s release notes web page for full details.
A word of warning though: The Unofficial Apple Weblog reports that some people are having trouble connecting to AIM with iChat following the update. Oddly, the update did include a number of AIM-specific features, so perhaps there is something to this. If you use AIM from iChat, you might want to wait a while and see whether there is a problem or not.