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What if you buy a network adapter without WPA? Practically speaking what does that mean? The Linksys g card has WPA, but I was going to get the dual g/a card, which doesn't seem to have WPA.
If security is needed (when is it not), I would definitely purchase a card that supports WPA. Otherwise you won't be able to enable all of the WEP fixes, etc. that WPA addresses, and will still be vulnerable. Furthermore, as of August 2003, Wi-Fi "certified" products were required to support WPA. I would look for products that support this standard, otherwise, you may be investing in something that will have to be replaced soon down the road.