As part of a press release posted on the Linksys web site, Linksys promises support of WPA for specific products by Summer of 2003. As of today, they still haven't come through on this promise. Following is an excerpt from their press release:

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WPA has been designed to be a firmware or software upgrade for existing Wi-Fi certified wireless LAN products. These upgrades will be made available for Linksys’ Wireless-G products when testing is completed. Firmware and software upgrades for Linksys products will be obtainable at www.linksys.com. By summer, Linksys will also provide WPA enhancements for many of its popular Wireless Dual-Band A+G products and Wireless-B products, including the BEFW11S4 (v2 and v3), WPC11 (v2, v2.5 and v3), WUSB11 (v2 and v2.5), WMP11, WCF11 and WCF12.
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The only products that they list that have upgrades available for them are:
Wireless-G PC Card (WPC54G)
Wireless-B PC Card (WPC11 v.3)
Wireless-G Router (WRT54G)

I have been waiting for a long time now to replace WEP with WPA. I sure hope that the products I have will soon have upgrades made available for them.