Dlink makes a device, DWL-G730AP. This is a multifunction device that can be configured as a router, access point, or wireless adapter. When I travel, I take one of these with me and configure it as necessary. Check <a href=”http://www.dlink.com/products/?sec=1&pid=346″>here</a>
They are calling these wireless bridges although most APs will work after some configuration. <a href=”http://www.linksysbycisco.com/US/en/products/WET54G”>Here’s</a> another one from Linksys.