Although I just started Geocaching the other night....I have already done a fair amount of research into Windows Mobile Apps for this purpose. I found a few...but by far the best is GeoScout. It connects right to the geocaching.com website and can download caches, logs, spoilers, and everything available on the website right to your phone. It also directs you to the cache with a compass, and even has a map with it (although admittedly not the best performing maps ever.) Once you find a cache, you can log it right from your phone and upload it to the site. Its wonderful. The only downfall is that it costs 40.00, but its quite worth it.
What I have been doing sofar is using geoscout to find a cache, get its coords, then use TomTom Navigator for Windows Mobile to get driving directions to the cache, if needed. Everything else is handled by GeoScout.
Also worth looking into is BeelineGPS....cost is 30.00 but it also looked nice. The deciding factor for me was GeoScouts ability to interact with the website. With BeelineGPS, I believe its all done by downloading waypoints from the site, then importing them into the application manually.
I am using it on a Sprint HTC Touch Pro.....but it should work fine with a tilt. When setting up GPS....I had to check the option to manually choose my GPS port number. The Autosearch showed it as port 4...but wouldnt let me select it...I had to manually enter it after selecting that option.
