IPW2200 BG
1 - emerge =net-wireless/ipw2200-firmware-2.4
2 - emerge =net-wireless/ieee80211-1.1.6
3 - emerge =net-wireless/ipw2200-1.0.8-r1
4 - Optional : if you use WPA Encryption,

ipw2200 version >= 1.0.4, emerge =net-wireless/wpa_supplicant-0.3.9-r1
ipw2200 version < 1.0.4, emerge =net-wireless/wpa_supplicant-0.3.8

2.6.14 kernel series : wpa_supplicant-0.4.6 used and options ipw2200 hwcrypto=0 in /etc/modules.conf

Linksys WRT54GS : add scan_ssid=1 to your /etc/wpa_supplicant.conf

To test your connection : wpa_supplicant -i eth0 -c /etc/wpa_supplicant.conf -D wext -dd

WPA2 encryption successfully tested