Based solely on the sales figures of BoxFinder, my letterboxing app for the iPhone, letterboxing is hot this Spring.

Sales are up 3x in March.  Spring is the perfect time to get out and enjoy the outdoors, so it makes sense.  If you haven’t tried Letterboxing, you should really give it a try.  It’s a great outdoor treasure hunting hobby — somewhat like Geocaching, but better, to my mind.

Trekaroo has a great introduction, and all the details and clues can be found at Atlas Quest.

And, of course, pick up your copy of BoxFinder for clue searching and offline clues.