I finally was successful connecting my Dell Axim X30 wireless to the internet. Here's my setup:
1. I have WOW (Wide Open West) broadband internet service.
2. I connect to WOW using a Motorola SB5100 cable modem.
3. I connect the Ethernet output port of the cable modem to the internet input port of a Linksys BEFW11S4 4-port wireless router. This router has 4 wired ethernet ports, plus an 802.11 wireless ethernet port.
4. I have the Linksys router wireless setup for 128-bit encryption, as well as the Dell Axim and a Dell laptop
I am able to access the internet from all of my desktop PCs through wired connections. Both my Dell laptop and my Dell Axim access using the wireless connection. Everything now works fine.
Good luck to you with your setup.