On Friday afternoon Apple seeded build 9D22 of Mac OS X 10.5.3 to developers.
Those familiar with the release state that the latest build offers 15 new bug fixes adding to a list of over 170. The build also has no known issues remaining.
Amongst the latest improvements are fixes to Macs failing to properly rejoin wireless networks after being woken from sleep. The build also contains fixes for systems failing to shutdown correctly and crashes when enabling system mode.
Due to the quick succession of builds and very limited issues it appears that the third update to Mac OS X Leopard will arrive in the next 2 weeks.