"...in honor of Canabalt's first birthday (back on September 1st), why not write a guided tour of how everything works instead?" Lots of good tidbits on here; the stuff on hitboxes is particularly well observed and explained.

Or, more specifically, a few jazz chords for guitar. Some nice reference on this site, particularly for other tunings such as DADGAD - not the best by a long way, though.

A rather comprehensive history of Hawaiian-style slack-key guitar.