Hehe, great idea. I hacked together a little app in python using pygame.
However, I did not add the soundfile, as I did not know under which license it was released. You can, however, simply convert the file the original poster provided (even on your N900, requires mplayer):

and then putting vuvuzela.wav in a new directory together with the contents of the zip-file i provided.

Have fun!

P.S.: One (among probably many) caveat, though: The soundfile doesn't loop very good. If we find a properly (i.e. CC) licensed one, we can however cut it as we see fit