Using Netgear DG834G wired via Ethernet to Evesham desktop.
Netgear WG511 PC card in Dell laptop.
Mac G4 Powerbook with Airport.
All connect to internet OK and PC machines network OK.
Detached house so just use access control limited to specific MACs with no SSID broadcast and no encryption.
If I was in a flat or terraced I'd look into WPA; although I'd imagine that would slow the radio comms down a bit.