Apple has seeded new builds of Leopard and Tiger 10.4.11 update to developers, both focusing on stability.

The new Mac OS X 10.5 Leopard build is numbered 9A500n and has been made available through the Software Update utility with recommendation to all testers of Leopard to download it.

This minor Leopard seed mainly fixes bugs and comes just one week after Apple asked developers to provide feedback on the 9A499 build which was seeded a few weeks ago.

The Mac OS X Tiger 10.4.11 update also sees a new build under the "8S2146" label. As MacRumors notes, it's been only five days since the last build numbered 8S2144 was seeded and this might mean Apple is now polishing the update for a release that we should expect for soon.