Before I sit down and make the mistake of start writing my own, I wanted to know my options for good, **modern**, fleet tracking options that are not too expensive. What I am looking for is something that [doesn't look like it was built in 1995][1] and that will not cost me [an arm][2] and [a leg][3] as I scale up. Brownie points if the project is Open Source, but using a hosted solution will do just fine provided that it is not too expensive. 

* What are people using to track on the field assets in realtime? 

* If price was not an issue, what would you use?


  [1]: http://opengts.sourceforge.net/
  [2]: http://www.esri.com/software/arcgis/tracking-server/index.html
  [3]: http://www.esri.com/software/arcgis/extensions/trackinganalyst/index.html