Can anybody suggest how I can setup a U.S. Robotics 802.11g Wireless Turbo Multi-function Access Point 805450 and a US Robotics MAXg Range Extender 5441a together? It's not clear to me if the 805450 supports WDS or not. I only need wireless access from the Extender, so I would be ok using the AP as a pure bridge from the LAN to the Extender.
How would that be configured?

The USR 5450 supports WDS and multipoint Bridging can be setup through the basic settings. Don't know any thing about the extender. I don't know your setup, but the 5450 has a huge range, 350ft. with the 5410 PCMCI cards. I would question your pc cards.