Have just had one of these delivered and it's a great device for the cash. It's also a base station you can flash with custom firmware (such as DD-WRT, OpenWRT and Tomato).
4x LAN ports, 1x WAN port and Wifi antenna (antenna can be replaced with an aftermarket one).
Note that this doesn't have a built in ADSL modem. It's perfect for either cable cutomers (NTL/Virgin/Telewest) or ADSL users who have a seperate ethernet modem.
The Buffalo AirStation G54 Wireless Cable/DSL Smart Router combines the 125 High Speed Mode wireless performance with Buffalo's AirStation One-Touch Secure System (AOSS). This router increases "real world" wireless performance up to 35% compared to a standard 802.11g Router. This Smart Router automatically detects and configures your Cable or DSL Internet connection. Security features include WPA, WEP, Privacy Separator, Intrusion Detector, and SPI firewall. In addition to fast wireless performance, WHR-G54S features a built-in external switch between wireless router and wireless bridge access point. The combination of speed, security, and push-button setup of wireless connections and Internet, makes the Buffalo AirStation G54 Wireless Cable/DSL Smart Router the ideal choice for your wireless network.