Apple has released an update to Aperture, which addresses a number of stability and performance issues with the program.
NikonView 3.1.1 install failure
Utilities Updates: Sleeper 3.1.1; QuickSwitch
Troubleshooting DVD Player 3.1.1: No Launch;
Two WebKit fixes.
Apple releases AirPort 3.1.1: Recommended for all AirPort Extreme users
Troubleshooting AirPort 3.1.1: Firmware discrepancy; Waking from sleep issues; more
DNS problems may be to blame.
Tips for speed, resolving post-update network issues.
Backup 3.1.1 (#2): Scheduled backups fail after sleep