It looks like the 10.5.1 update has just hit, bringing with it fixes to Airport, Disk Utility, iCal, Mail, Printing, Security, Finder, and Time Machine. The big fixes that we can see are the finder network data loss problem that was reported last week, re-wording the firewall to reflect what it really does, fixing a read-only network share issue, and improving Back to My Mac functionality. Big list of changes after the jump.
Gizmodo has the list on there site it is quite extensive and all. Go check it out.