I have been using a Airport Expess 802.11g and an airport express g for 4 years. Set the first router up to your modem mine is the Airport g I don't think it matters which one is your main hub. It has to be encrypted with WEP 128 NOT WPA. They can have different device names but they have to be programed to the same Network Name, Password and be on the Same Channel.
Set both devices to Participate in a WDS network.
Set the first device to WDS MAIN. Once its on and working log on to the second device and set it to WDS Remote. It is easier to do this in the manual mode. Again the base station name and password can be different but the wireless or network name and password must be the same.
Check the box to allow wireless clients in WDS on both devices.
Enable Air tunes on the Express under music in the tool bar if you plan to use it.

I know and use this with the Extreme as my main and Express as the remote. I don't see why it would not work the other way. I plugged my original xBox into the ethernet of the Express and was able to log onto the Halo sites.

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