The first release candidate (RC1) has been released for Firefox and a final release is expected on November 9th. Mind you, if you are currently running the PR build, and you don't feel like being annoyed because a bunch of extentions don't work in the current RC1, don't upgrade but rather wait for the final release.
PuTTy has been updated to version 0.56 to fix a serious security hole in SSH2, and since FileZilla relies on PuTYy technology for its secure FTP connections, FileZilla has been patched to version 2.2.9.
Ethereal is onto version 0.10.7, and Eudora 6.2.0.8 is available as a beta release. A new stable release (1.2.6) of GnuPG is available, and a new version (v3.23b) of GPGkeys - part of GPGshell - has been released to fix two slightly annoying but non-critical errors.
If you use any of the programs mentioned above, I suggest looking into upgrading. I would rate the FileZilla and PuTTy upgrades as essential because of the security implications, whereas the Eudora, GnuPG, Ethereal, Firefox and GPGKeys updates are not really critical right now.
Remember the rule : don't fix what ain't broken. Keeping that in mind, I did install Firefox RC1, Ethereal network Analyzer 0.10.7, the FileZilla update as well as the GPGkeys patched version. I'm a geek, what can I say?