Some short notes:

textdrive.com is rough around the edges but a real "professional" hoster. One troubleticket issued, 1h later problem fixed and closed.

Abbreviation juggling ajax (the Ruby on Railers' probably yawn now):

www.adaptivepath.com is damn cool stuff

I just implemented some little things with that approach ... web application development can be fun :)

SCIgen is a program that generates random Computer Science research papers, including graphs, figures, and citations. It uses a hand-written context-free grammar to form all elements of the papers. Our aim here is to maximize amusement, rather than coherence.

www.pdos.lcs.mit.edu

If you've been ever to one of the huge cemeteries in Hong Kong you'll understand that they are not kidding:

news.bbc.co.uk