10.5.6 is out, go grab it from Software update (377mb here!) or via the standalone installer.
Here are the details or check below. It looks like there are many performance improvements in this one! Yes are feeling the snappieness, are you?
Summary
The Mac OS X 10.5.6 Update is recommended for Mac OS X 10.5 Leopard versions 10.5, 10.5.1, 10.5.2, 10.5.3, 10.5.4, and 10.5.5. It includes general operating sys
