System 7.5.5 Update -- It's clear now that Apple has not yet released System 7.5.4, and in fact, according to sources, is fixing problems relating to the IR capabilities of some Macs. The update, when it comes out, will be renumbered to 7.5.5. The next mention of it in TidBITS will be when it's actually available. [ACE]
Improve Apple Services with AirPort Base Stations
You can make iChat file transfers, iDisk, and Back to My Mac work better by turning on a setting with Apple AirPort base stations released starting in 2003. Launch AirPort Utility, select your base station, click Manual Setup, choose the Internet view, and click the NAT tab. Check the Enable NAT Port Mapping Protocol (NAT-PMP) box, and click Update. NAT-PMP lets your Mac OS X computer give Apple information to connect back into a network that's otherwise unreachable from the rest of the Internet. This speeds updates and makes connections work better for services run by Apple.