We've got lots of clips at Music & Vision too, although mostly
short extracts.  Completely free access, and no cookies or signups
etc.  They're mostly used to illustrate CD and DVD reviews, e.g.
http://www.mvdaily.com/articles/2005/03/britten1.htm which has real audio
clips on pages 2 and 3, plus a short Apple Quicktime movie on page 3.
There's also a browse feature to play all recently added audio clips:
http://www.mvdaily.com/cdbrowse/mvcdrrad.cgi

Best wishes                                                                                Keith