Sun's posted the third update to the JDK 1.6.0 for Windows. The full internal version number for this update release is 1.6.0_02-b06 (where "b" means "build"). (The Linux and Solaris releases don't seem to have been updated yet.) It's not immediately clear what changed since b05 a couple of weeks ago, but I suspect this release plugs a couple of security holes.
Sun has posted the twelfth update release for Java 5.0 Tiger with fixes for a few dozen assorted bugs. "The full internal version number for this update release is 1.5.0_12-b04 (where "b" means "build"). The external version number is 5.0u12." As usual, it's available for Solaris, Windows, and Linux.