JRE 6.0 Update 13 has been released and addresses a couple of security issues.  You can see the release notes for this version here.    If you have a business case for remaining on the older JRE 5.0 version, Update 18 for it has been released as well.  You can see the release notes for it here.

Both of these updates address various security issues.

Thanks to Roseman for the info.