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There seems to be quite a plethora of Ruby/Rails libraries appearing aiming to simplify handling geography and distances. In some cases these libraries do quite distinct things (zip codes vs. longitude/latitude, map output vs. distance calculations) but t
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YM4R (Yellow Maps for Ruby) has a Rails plugin for Google Maps (YM4R/GM), a plugin for Mapstraction (YM4R/Mapstraction), a gem with ruby helpers for geocoding and the Yahoo! Maps Building Block APIs and tools to generate tiles for custom Google Maps.
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This ruby gem will allow you to read, write, and update the GPX files that you download from your personal GPS device. It also features limited support for converting some NMEA formats to GPX!
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Nintendo DS does geopositioning with WiFi
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I did a very simple little Ruby On Rails application a while back using the XPFE (Cross Platform Front End).