Wireless G vs. Ethernet

802.11b has a speed up to 11Mbps (mega-bits per second)
(Note: cable modem service typically averages no more than 4 to 5 Mbps.)

802.11g [Wireless G] allows speed up to 54 Mbps (depending on connection strength;
mine is probably halved to 26 Mbps).

Ethernet is the fastest wired network protocol, with connection speeds of 10 megabits per second (Mbps) to 100 Mbps or higher (uses Category 5 ethernet cabling).

Links:
Linksys A vs B vs G chart
Linksys Wireless G Bridge
WRT54G Access Point - uses a full duplex 10/100 Switch, and allows both Wireless-B and Wireless-G connectivity.