The Netgear WG311T is one of the WLAN cards (802.11b/g) that "just works" under FreeBSD. Since it uses the Atheros chipset (see the man page for the ath driver for more details), you will experience a plug and play feeling. In all details:

kldload wlan_tkip
kldload if_ath

You should now get something like this:

ath0: <Atheros 5212> mem 0xfeae0000-0xfeaeffff irq 23 at device 11.0 on pci3
ath0: Ethernet address: 00:11:22:33:44:55
ath0: mac 7.9 phy 4.5 radio 5.6

You are now free to use wpa_supplicant to connect to your wireless networks. If only more devices would work like this under FreeBSD...