Using Ad-Hoc Network
Using a computer-to-computer (Ad-Hoc) network can help quickly determine if the Wi-Fi syncing problem is related to the network. Note: If you are using an iPhone, it might be necessary to place the device in Airplane Mode in order to connect to the ad hoc network. You can enable Airplane Mode in the Settings application.
On Leopard you can do this via System Preferences > Network.
Select Create Network from the Network Name dropdown
Type the name of the network
Click OK and make sure that the status is On
On the iPhone, open Settings > Wi-Fi and connect to the network that you just created
Sync
After the network connection has been established, start the 1Password iPhone application and try to sync again.
If the sync was successful then you need to check your current local Wi-Fi network settings. If the sync failed then the problem is related to something else.