I'm a day late to pay tribute to the great Bo Diddley, about whom many of you have read by now. There is a lengthy piece in the Los Angeles Times here. This great photo comes from there.
Rockin' Padre Mickey has weighed in, of course, as has prolific Greensboro blogger Ed Cone (Ed's has a video clip).
Now there is a square guitar in the heavens.
P.S. P.J. has a fine memorial post, with a link to the New York Times tribute and some music.