[mikester]

From 802.11b to 802.11g I could see justifying an upgrade but be sure to get all of your client wireless devices upgraded as well. If there is one 'b' client on the network the 'g' network will revert to 'b' operation as a whole because of that client.

802.11g vs b is like the difference between Ethernet and Fast Ethernet (almost). Fast Ethernet was full duplex 100mbps where as Ethernet was 10mbps HALF duplex. 802.11g is 54mbps but backwards compatible. I could go on but I you will get better performance with the g stuff than the b stuff. Plus with some newer hardware you will get away from the likes of WEP for 'security' into something that can actually be considered 'secure' with WPA2 and AES encryption.