Oracle has released a new Version 6 Update 24 of its Java software (which it acquired along with Sun Microsystems). This version fixes 21 identified security vulnerabilities. There is more information in the Release Notes; a list of security fixes, with CVE numbers, is here. It also incorporates some updated time zone information. Because of its security content, I recommend installing it as soon as you conveniently can.
The new version is available for Windows, Linux, and Solaris (SPARC and Intel) systems. You can use the products built-in update mechanism, or you can download.versions for all platforms here. Mac users should note that Apple releases its own version of Java, and it typically takes a few weeks to get the latest updates. As I noted in a post last fall, it’s not clear that everyone needs Java, but if you have it, you should keep it up to date; it is one of the popular attack vectors for the Bad Guys.