So I gave myself a challenge : Write a simple cloud IDE in a language you don't know yet on a platform you haven't used.
The result :
www.tryperl.com You can write mostly any perl code (upto 5.10) with a snazzy STDIN option you can use ARGV and <>. If you sign in with GitHub it maintains all your scripts as personal github gists

Sweet and Simple!
It has a
mostly secure sandbox that runs perl code, like I said I'm a perl/linux newbie and that's why it's mostly.
See this for the stack I used:
www.tryperl.com/aboutSee
this post for my server security implementation.