The Nebraskan State Legislature in the United States is a unicameral house. There is no upper house such as the Senate in the Australian system or the Legislative Councils in the Australian states. The Nebraskan Senators at the federal level recently proposed that the state adopt a bicameral legislative structure. (more)

Queensland Senator Ian McDonald has an interesting proposal for a Queensland Senate or Legislative Council . He argues that the Mayors should represent the Upper-house on fixed four year terms. McDonald doesn't say they would have to sit, so possibly some form of virtual arrangement can be made since the Mayor's will have responsibilities to their cities and towns. Interesting. (more)
Cam Riley: South Sea Republic. Freedom, liberty, equity and an Australian Republic.