Not to say I’m late but I do confess to being a bit behind in my blogging here at Nowhere! Apple has released what should be the final major Leopard update (10.5.8) before they release Snow Leopard (10.6) in September.
From Apple’s Software Update note, this is the typical "enhances the stability, compatibility, and security of your Mac." The release has fixes for AirPort, Display System Preferences, and Bluetooth. The real meat-and-potatoes in the 10.5.8 release are to be found in HT3606 (Safari 4.0.2, an Automator fix for Aperture, iCal and Sync fixes, etc) and HT1222.
BTW, there were security updates released on August 11th (Safari 4.0.3) and 12th (security update 2009-004) so you might want to get a wiggle on and get those as well.