I found this website, it has 400 english tongue twisters:
http://www.uebersetzung.at/twister/en.htm.
What I want people to do, is choose any of the four hundred songs, and record themselves saying them as fast as they can...
I will record one soon, can you please try your best not to upload the sounds to the forum, try your best to upload it to your own webspace, if you can't, then I will provide a public ftp for people to upload their sounds...