So, while Amanda is here to slackpack me, I've been working on a new feature late into the nights. Admittedly, it's largely for selfish purposes, but for those of you who also have e-mailing ability on your cell phone but don't necessarily have access to Atlas Quest on the Internet--or maybe you don't have an easy way to store clues on your device--this feature might be very useful for you. =)
To make it work, send an e-mail to 'boxes' at 'atlasquest.com' including the location you want letterbox clues for as the subject. It's just a normal run-of-the-mill location-based search, so anything that works for a location based search works here--cities, intersections, addresses, zip codes, and so forth. Leave the body of the message blank. (Or you can write stuff in it, but AQ will ignore anything you write.)
After a minute or two, you should get a reply with the clues for that location. If the e-mail address is one that is registered with Atlas Quest, it will also strip out clues for boxes you've planted and already found.
You have mail! =)