Apple has released Java updates for both OS X Snow Leopard and OS X Leopard. These updates bring enhanced security, compatibility, and reliability to both versions of Mac OS.

Snow Leopard: 

Java for Mac OS X 10.6 Update 5 delivers improved compatibility, security, and reliability by updating Java SE 6 to 1.6.0_26.

Leopard:

Java for Mac OS X 10.5 Update 10 delivers improved compatibility, security, and reliability by updating J2SE 5.0 to 1.5.0_30, and updating Java SE 6 to 1.6.0_26 for 64-bit capable Intel-based Macs.