[Al Skierkiewicz]

Mike,
I had a similar problem and found that the second router (the wireless one) sees the other router as a different device. I set permanent IP addresses on both and configured each to accept the IP address of the other. You must be sure to have the file sharing settings correct on all computers for the drives and computers to share files and resources. (It is possible to share printers and even modems this way.) The settings are tricky and drove me nuts for a while.
I am not using a server but have 1 XP machine wireless, 1 wired, 1 Win 98 wired, 1 Mac wireless running OS10 and one new HP printer with built in NIC, now all nicely playing except for files to and from the Mac. It prints though, Airports don't play well with others and I am considering removing that component.