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I set up a wireless LAN a few months ago, and I found that WiFi support in Linux is somplace between "lousy" and "not that great." For example, if you want a PCI card with open source drivers and good encryption support, then you will probably have some problems. On the other hand, if you need a PCMCIA card, don't mind using the Windows drivers with NDIS, and don't care about encryption, then it shouldn't be too painful.
I ended up going with a PCI card with a Ralink RT2500 chipset because it was inexpensive (less than $30), it had 802.11g support, and the manufacturer had open-sourced the drivers. Unfortunately, the version 1.0 "stable" driver for kernel 2.6 wasn't (the 1.1 beta is fine, though) and I never did figure out how to get WPA-PSK set up (although, admittedly, I didn't try terribly hard). Not the easiest hardware installation I've ever done, but it could have been worse. At least it wasn't that hard to get a basic network connection, even if it isn't as secure as I'd like.
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