As a Valentine's day present to us all, Apple has released Mac OS X Update version 10.4.5. Run Software Update now to download and install the System Update, but be warned: a restart is required. My Intel-flavored version of the update weighs in at 40.6MBs (Scott reports that his PPC version is only 6.4MBs in size) and "is recommended for all users and includes general operating system fixes, as well as specific fixes for the following applications and technologies: iChat video conferencing, Safari rendering of web pages, usability of Dashboard and widgets, viewing of QuickTime streaming media behind a firewall, printing to some Epson printer models, iDisk and Portable Home Directory syncing, time zone and daylight savings for 2006 and 2007, VPN connections to Cisco servers when using NAT, compatibility with third party applications and devices" and a slew of other "previous standalone security updates."
You can find more info about the update via this KBarticle. Lock and load.
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