Apple has released and updated a few troubleshooting articles covering problems people have been having with iWork and iLife applications after updating to 10.6.2, with using VoiceOver on headless Macs, and when trying to activate iPhones.
iWeb & iWork: unexpected quits
A number of people have reported iWork and iLife applications (especially iWeb) quitting unexpectedly when launched, or when doing a specific task like adding text fields in the program. This is because of a corruption in how the system is handling certain fonts, and can be tackled in one of two ways: Starting in Safe mode to clear the font database, or avoiding the use of Helvetica and Courier fonts. These issues are briefly in the following articles:
Recent problems with the 10.6.2 update:
http://support.apple.com/kb/TS2311 (old article, but may still be relevant for some, and basically indicating that regardless of the OS version, font troubles may be to blame for these problems).
A number of people set up their Mac Minis and Mac Pros to run without a display attached. This can be if you've got the computer running as a server. If you have VoiceOver enabled when the computer is running like this, you may experience system or application slowdowns, and the solution is to fake it to the computer that a display is connected by attaching a video adaptor to the computer even though a display does not need to be connected to the adaptor.
iPhone SIM Card activation
When activating an iPhone with iTunes, you may run into an issue where the system does not recognize the SIM card on the phone and cannot receive required information from the phone. The easy remedy for this is to locate and enter your SIM card pin number, which depend on your country and are listed in the following KB document: http://support.apple.com/kb/HT1316