Boot Sale Sounds just put up a selection from the 1980 LP Miniatures, a cool collection of tracks each lasting no longer than one minute. It was put together by Morgan Fisher who got folks like The Residents, Robert Wyatt and Fred Frith to contribute. Check it out, fer sure.
I've mentioned somewhere before the one minute vacations at quiet american. These are one minute field recordings submitted by folks all over.
(Way longer than one minute are my own field recordings . . .)