multiple iPod devices in Finder

When I connect my iPod to my computer, Finder begins adding multiple copies of the iPod to the Devices list in the left panel. None of these can be dismounted - I get a message that the device is in use and I should try quitting applications. Restarting is the only way to get rid of them. Finder even keeps adding copies after the iPod has been physically disconnected. iTunes does not start when the iPod is connected and does not give me an option to sync it. Any ideas? Thanks.