I have both Revision A and B Dir-655 routers.
Revision A populates the Wireless device list. Revision B does not.
I have tried different firmware updates for Revision B (currently using 2.03NA).
I have noticed that if the router is reset.. you will get one and only one shot at getting the Wireless Device list. If you change to look at a different page (tab) after looking at the wireless status, and then go back, you will not get a listing.
It appears the issue is a scripting (code) issue with "st_wireless.asp".
The problem is not browser dependent as I tested with IE, Chrome, Firefox, and Safari.