I have recently installed a Linksys WRT54GX2 router. Connected to two (2) PCs running Windows XP SP2 and one (1) running Windows 2000.

I have set up MAC filtering but nothing in addition. I have read where Windows 2000 is not compatible with WPA. Do I just set-up with WEP and MAC filtering or can I set-up WPA or WPA2 with MAC filtering?

The way I attack WiFi security is threfold.

1. MAC address access list
2. WAP encryption (128 bit)
3. Hide SSID

I find that this works a treat.
Basically if the AP can't be seen then it presents less of a target.
The MAC and WAP adds more security without slowing access speeds.

I must admit I have only tried WPA once and I ended up locking myself out of the AP, so I stuck with the above method.

Couldn't comment on Curly's post so I wanted to second his response. That is how I secure my wireless network as well. I had a Win98 laptop on the network so I too had to use WEP.