If geocaching is finding hidden caches by their GPS coordinates (or not necessarily?), then commentcaching is the quest for information caches hidden in obscure comments. Previously a commenter suggested that they could associate the hours for their local library with an obscure username and a supplemental text string. This comment followed a post about using a daily blog post as an online associative array or information caching using blog entries with an obscure user name and some unique content text.
But I think the idea of commentcaching is a good variant on the scheme. It doesn’t require a blog and with a blog with an open comments it’s easy enough to cache info in a comment. The trick is of course not to be too obviously spamlike or so far off topic to be not even annoying but random. So Bleedsnoot – I have also commentcached your library hours under googapp sdk.
And that’s 11 characters.