I don't have my copy of Tableau handy any more (using a Mac now) but I suspect that some of the map visualizations would probably be very interesting for visualizing these salary rates both spatially and maybe temporally depending on if there is trending data.
I took a quick look at the map view of this data and couldn't really come up with anything compelling to show, although a time series of bubble sizes could definitely be interesting.
Take a look at this old (and ugly!) post I did a while back: http://blog.mozilla.com/data/2010/03/06/using-tableau-to-inv...