AirPort very, very slow & intermittant after update

I installed the AirPort Extreme Update 2007-001 from today's Software Update, and on restarting, my wireless connection became extremely slow (56k speeds at best) and very intermittant -- it'll work for a minute or so, then lag for two or three minutes with no signal. I've rebooted several times, but it hasn't helped.
Is anyone else having trouble after the update?
MacBook Pro, 15" Mac OS X (10.4.8)

The "solution" is at http://www.macfixit.com/
Problems after updating
[In many cases, the problems listed below are incidental to the update and can be solved by some of the workarounds listed in our wireless troubleshooting tutorial -- many users have reported success with turning off wireless encryption (WEP, WPA) on their Base stations, for instance.
If you are having extreme difficulties after applying this update, the workarounds listed in our wireless tutorial have failed, and you absolutely need to restore wireless access, you can try this somewhat risky workaround:
Download the most recent version of Mac OS X for Intel (10.4.8)
(http://wsidecar.apple.com/cgi-bin/nph-reg3rdpty2.pl/product=11796&cat=1&platform =osx&method=sa/MacOSXUpd10.4.8Intel.dmg)
but do not install it.
Download and install the shareware application Pacifist
Drag the Mac OS X 10.4.8 installer package onto the Pacifist application icon.
Click the triangle next to "System" to expand it
Click the triangle next to "Library" to expand it
Click the triangle next to "Extensions" to expand it
Scroll down and find the file IO80211Family.kext. Drag it to your Desktop or another location (you will have to enter your administrator password)
On your Mac OS X startup drive, navigate to /System/Library/Extensions and locate a similarly named file (IO80211Family.kext). Move it to another location for safe keeping.
Now drag the file from step 7 (the one that you retrieved from the Mac OS X 10.4.8 install package) into the /System/Library/Extensions, in effect replacing the newer file (installed by the AirPort updater) with and older copy -- you will have to enter an administrator password.
Restart your Mac
This workaround is risky because you should not generally mix and match kernel extensions after updates, you will lose some improvements (including security refinements) brought about by AirPort Extreme Updater 2007-001, and new conflicts can ensue. Still, in a bind, it can restore wireless connectivity where other workarounds fail.]

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