Get the USBConnect Mercury to work with Snow Leopard

This isn't too hard, but annoying that no one really has a good set of instructions, so here you go:

• Leave the modem out of your machine's USB port
• Download this software from SierraWireless if you've previously installed SierraWireless software
• Run the "Watcher Remover"
• Restart your machine
• Open "System Preferences"
• Click the icon that's likely blank with a phone icon
• From the drop-down that likely says "Default", select "Add Configuration"
• Label it something like "ATT"
• Click "Advanced"
• Select "SierraWireless" from the "Vendor" list
• Select "GSM" from the "Model" list
• Click "Ok"
• Make sure you check the box that says "Show Modem Status in Menu Bar"
• Close your Preferences (you should now have the little phone icon on the upper right of your screen where the time is typically displayed)
• Insert the USB modem
• From the phone/modem icon in the upper right, select "Connect" (if the connection profile you just created is the only one you have, it will automatically have a check mark next to it; with multiple connections, make sure the connection profile is checked)

That's it -- no additional software from SierraWireless required.

Enjoy.