The current AEBS offers Gigabit Ethernet, which means you have to use an Ethernet cable, which results in speeds of up to 75MB/s with other Gigabit devices.
The current AEBS offers 802.11n wireless speeds in theory, in real life the router gives you around 7MB/s via wireless LAN.
Or are you asking for information on something else? You haven't really been clear on this.