Never knew about this

[Saintaholic]

How to: Set Tomato Firmware for Wireless Client Modes


If you're like most right-thinking people, you probably use your wireless router the way that nature intended—to broadcast wireless signals to clients. But, if you've flashed your router with an alternative firmware, such as the increasingly popular Tomato, you can actually run your router in reverse. In other words, you can use your wireless router to pick up the wireless signal from another source, routing it to devices connected by Ethernet.

Another way to use a router in client mode is to extend a wireless network. For example, suppose your primary wireless router is on an upstairs floor, but your laptop can't pick up the signal when downstairs. Connecting your downstairs PC to a router in client mode may let you pull in that distant signal, especially if you outfit the router with more a powerful antenna.

read more here :

[Decapper]

This has been able for certain wireless routers for sometime... Wireless bridge.. Or access point option in your router menu..

I have a access point which is very old (2mbits) but it allows all of the above. Although I do have to set it up with telnet..

Still a good find and thanks