This isn't something that I have done research on, but like Professor Wiseman I would be worried about the security aspects of online voting. However, nonetheless I am intrigued by the prospect and believe that a number of studies at the municipal level here in Ontario are being conducted or will be conducted in the future, and ought to continue to be conducted. I think it's definitely something that should be explored.
All the while we should keep in mind that the Internet is not necessarily a secure environment for this kind of thing.