After playing around with settings, I was finally able to access my wireless network with my HP iPAQ 110. Here's what I did.
- Under Wireless > Wireless Security, set the model to WEP, setting a passphrase and generating keys.
- Make sure your wireless is enabled.
- Once the network shows in your iPAQ, set the Authentication to Shared and the Data Encryption to WEP.
- Select the key index and enter the key equal to the Default Transmit Key from the WRT54G.
- Check "Use IEEE 802.1x network access control", and an EAP type of PEAP.
That's it - you should be able to connect now.