QuickTime Player 7.6.6 for Mac OS X 10.6.3 -- Apple has released QuickTime Player 7.6.6 [1] for Mac OS X 10.6.3 Snow Leopard with absolutely no release notes, so there's no telling what has changed. Remember that Snow Leopard now comes with a new QuickTime Player for QuickTime X, so the only reason you would want QuickTime Player 7 is because it supports older media formats, such as QTVR, interactive QuickTime movies, and MIDI files on Snow Leopard. It also accepts QuickTime 7 Pro registration codes, which turn on QuickTime Pro functions. Apple explains more at this Knowledge Base article [2]. (Free, 10.65 MB)
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Java for Mac OS X 10.6 Update 2 -- Apple has released Java for Mac OS X 10.6 Update 2 [4] for Snow Leopard users, updating Mac OS X's Java SE 6 to 1.6.0_20 and delivering "improved reliability, security, and compatibility for Java SE 6." The only details given revolve around security fixes [5], so it's probably worth downloading this update even if you don't anticipate using Java applets much. The update requires Mac OS X 10.6.3. (Free, 78 MB)
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Java for Mac OS X 10.5 Update 7 -- Apple has released Java for Mac OS X 10.5 Update 7 [7] for Leopard users, updating Mac OS X's J2SE 5.0 to version 1.5.0_24 and Java SE 6 to 1.6.0_20 and delivering "improved reliability, security, and compatibility for J2SE 5.0 and Java SE 6." The only details given revolve around security fixes [8], so it's probably worth downloading this update even if you don't anticipate using Java applets much. Also note that J2SE 1.4.2 is no longer being updated and remains disabled in this update, which requires Mac OS X 10.5.8. (Free, 122 MB)
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Keyboard Maestro 4.3.1 -- There's nothing like real-world usage to flush out the last few bugs, as evidenced by the quick update to Keyboard Maestro [10] 4.3.1, which fixes potential crashes when executing AppleScript or shell scripts, and when using device triggers. A few other minor bugs have also been fixed, and Stairways Software also added support for naming more X-Key keyboard keys and improved handling of negative numbers in the Move Window action. Full release notes [11] are available. ($36 new, free update, 9.1 MB)
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[1]: http://support.apple.com/kb/DL923
[2]: http://support.apple.com/kb/HT3678
[3]: http://db.tidbits.com/article/11292#comments
[4]: http://support.apple.com/kb/DL972
[5]: http://support.apple.com/kb/HT4171
[6]: http://db.tidbits.com/article/11291#comments
[7]: http://support.apple.com/kb/DL971
[8]: http://support.apple.com/kb/HT4170
[9]: http://db.tidbits.com/article/11290#comments
[10]: http://www.keyboardmaestro.com/
[11]: http://www.keyboardmaestro.com/documentation/4/whatsnew.html
[12]: http://db.tidbits.com/article/11289#comments