'Android Cacher' is simply the best geocaching application for android phones.

Import the geocaches from geocaching.com or opencaching, organize them with
tags and finally find them!
It features a simple formula editor, experimental bluetooth mouse support,
live folders, quick-search and a convenient help system.

download it from the android market.

 

Your entry point to your geocaching adventure, the tag list.
detail view of a cache, featuring: HTML description logs editable waypoints with formula support and a convenient method for editing variables