Great app, tested it today with my just arrived Nokia LD-3W and n800(Diablo). Here's another idea for a feature: use the url tag from the gpx file (<url>http://www.geocaching.com/seek/cache_details.aspx?wp=GC1993G</url>)
and make it clickable, so the url opens in the browser. In fact, you don't really need the url, since the url is allways like that. You can add options like &decrypt=yes, &log=all etc. This is quite handy if you have your internetconnection with you during the cache (eg btphone with umts), and any stylys tapping that can be avoided during caching is worth it imho.