Just ordered the TP-Link TL-WN610G PCMCIA card for my PowerBook as they are very cheap (~10€ new) and the chipset is AR2414: listed as supported by the ath5k driver.
TL-WN610G.jpg
In my PowerMac there's a regular 54Mbps TL-WN350GD PCI card (AR2417) for MorphOS.