Some Snow Leopard users have suffered from AirPort problems since 10.6 was released. In this client update, which requires 10.6.2, Apple says it has fixed three major bugs. First, it repairs some systems that, when upgraded from Leopard to Snow Leopard, could not turn AirPort on or off. Second, the update eliminates what Apple calls an "occasional" problem when using Wake on Demand, where network access would be unavailable. (Wake on Demand, new in Snow Leopard, lets a computer connected to an AirPort Extreme or Time Capsule base station be woken over either Ethernet or Wi-Fi for network access to advertised Bonjour services.) Finally, this update restores the capability to create software base station (look in the Sharing preference pane) or computer-to-computer networks to some MacBook, MacBook Pro, and Mac mini systems that previously had trouble.
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.
AirPort Client Update 2009-002
better-looking. Edit your PDFs anywhere. Sign contracts, make
changes, fill forms, and more. All while you’re on the move.
Syncs via iCloud and Dropbox. <http://smle.us/tbpdfpen-ipad>
As a workaround I use the drop box feature now.
Could you describe your failure in a bit more detail? Is the AirPort loosing commection? Is the AirPort staying connected, but the file transfer stalls out?
If the transfer is just stalling out, you can try this command to see if it helps:
sudo sysctl -w net.inet.tcp.delayed_ack=0
It still stinks when you're one of the few with problems.