Geotude vs. Lat/Lon

Does anyone have experience using Geotude? I am looking for a fixed-sized area based earth grid system to use instead of the traditional Latitude开发者_运维问答/Longitude, so any comments or other types of grid would be super helpful!

Have you seen the bing Quadkeys? http://msdn.microsoft.com/en-us/library/bb259689.aspx (scroll to middle of page)

Are you familiar with R-Trees? http://en.wikipedia.org/wiki/R-tree