" I recently had to move my cable modem to another room since it couldn't maintain a signal on the old line in my bedroom. My G4 was connected to the router via Ethernet so I had to find a way to get it connected. Initially I was going to get an original AirPort card, but quickly abandoned that idea once I found out they were selling for $150+.

Anyway, I started doing some research and found a couple of reports that said the Buffalo Technology WLI2-PCI-G54S worked. I found one at the local Best Buy for $29. My research showed that most PCI cards would work if they had a Broadcom chipset, but even then they might not work if had the wrong version of the chip. (the only 802.11g Broadcom chip based card I had problems with personally was the Microsoft MN-730 model (discountined long ago) which needed some plist editing mentoined in older article here.-Mike)

Anyway, this one works fine. I made sure to download and install the latest version of the AirPort software from Apple before installing the card. After installing it and booting up, OS X didn't seem to notice the card until I went to Network Preferences, upon which it said that a new AirPort network port had been detected. After that I just had to choose my wireless network from the AirPort icon in the menu bar.

Here are the nerdy details:
Buffalo Turbo G Wireless Desktop PCI Adapter Turbo 125 High-Speed Mode
UPC: 47464 10908, Item number: WLI2-PCI-G54S
Here's the Best Buy link. You can check the inventory of your local store and see if they have any.
Let me know if you need any additional information...
-Adam"

I've added this to the previous item on Airport 3.x compatible PCI/PCcards in the FAQ's networking section. (Some "Buffalo" 802.11g adapters in the past were listed as MacOS compatible on the packaging IIRC.)

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  (A web page copy of his report here.)
  
  (Full reviews of G4 and G3 upgrades compared to stock CPUs, including real world apps/game tests, install info, etc. are linked at the CPU upgrades page. OC/CPU module articles are on the Systems page.)

You can find the full reports by searching the database selecting the indicated Mac model and upgrade card brand/type. If you've upgraded the CPU on your Mac, send a review with your experience and rating. Search the database for entries from most every upgradable Mac model *before* you buy. (Searchable by mac model/upgrade brand).