Features:
- Seek cache by "Address/Postal Code/Geocache Code/GPS location".
- Cache list and detail infomation. (Title/Owner/Description/Hint/Log/Map/etc...)
- Post cache log.
- Pickup and Drop TB/GC.
- GPS Monitor.
- Mobile GoogleMap.
- AppToDate.

Requirements:
- Windows Mobile 5/6 Professional device.
- Mobile Google Maps (free download from Google).
- Internet Connection (flat rate connection recommended!).

More screenshots here.

Update Description:
v0.2.35.41:
- "Cache not Found" issue fixed.
- "Internet Connection Failed" issue fixed. (In case of proxy uname/passwd required)

v0.2.35.40:
- Trackable Post Log failed issue fixed.
- Attributes disappear issue fixed. (Cache description)

v0.2.35.39:
- Crash bug fixed. (GC17HAF)

*** [May 7, 2009] by Steven B using HTC Touch Pro
I agree with the above poster... the program is awesome except for the compass and the fact that it points the wrong way.

*** [Mar 21, 2009] by PaulH using O2 Orbit 2
This is a great all-in-one product, able to download information straight from the geocaching website without you having to mess around with .loc files. Its got a the great capability to search nearby caches no matter where you are. This would have been a 5* product if it wasn't for the compass function which is not only useless, but actually sends you the wrong way - *some* of the time. Perhaps as the author is in japan, there may be some issues with calculating the direction according to which hemisphere you're in. Also, the compass can only point in one of eight directions, which isn't that helpful. Update the compass function and this could be *the* PPC Geocache program to use.