there are probably several free hosters out there.
but i can highly recommend you dropbox.

its 2gb of free online storage which also syncs between different computers and keeps your files up to date.
for example i have my whole processing sketch folder in the dropbox so i can access it from any computer.
what i really like is that you can copy links and use it to share files with others.
you can also upload whole folders and link to the html file as they work as html sever.

just take a look

www.dropbox.com

http://openprocessing.org if you don't mind your code to be put under GPL...

Thanks, I'm gonna try them