Apple made available two updates today for Mac OS X Leopard. The first addresses issues with Apple Remote Desktop 3.2 Client, taking it up to version 3.2.1. I had personally experienced issues with this, when repairing permissions, Disk Utility would warn of errors with ARD, so this is a welcome update. After installing, I found that both restarts and cold starts on my Mac Mini were lightning fast.
The second update takes iPhoto to version 7.1.1 which improves overall stability and addresses a number of other minor issues.
Both of these updates are available through the Mac OS X 'Software Update' feature.