Apple has posted a few updates during the last few days, here's a recap:
iPhone Firmware 2.0.1
This new version fixes bugs and improves performance. iPhone 3G owners or iPhone EDGE owners who have upgraded to version 2.0 will be able to obtain the update through iTunes.
Aperture 2.1.1
This update supports general compatibility issues, improves overall stability, and addresses a number of other minor issues.
Security Update 2008-005
Security Update 2008-005 is recommended for all users and improves the security of Mac OS X. Previous security updates have been incorporated into this security update.
Lexmark Printer Driver 1.1
The Lexmark Printer Driver Update includes the latest drivers for printers you have used on your system.
The last three updates are available either through the Software Update utility or through Apple's web site [1].