Run C, C++, PHP, Python, Ruby Programs Online

I was searching for resource to run my programs online. And I found codepad.

Codepad is an online compiler/interpreter, and a simple collaboration tool.
Paste your code there, and Codepad will run it and give you a short URL you can use to share it in chat or email.

Languages that it supports are:

C
C++
D
Haskell
Lua
OCaml
PHP
Perl
Plain Text
Python
Ruby
Scheme
Tcl

This facility is particularly useful when we are away from our desktops/laptops and want to execute any program in the above languages.
I used it to run very simple programs and it works fine. It detects error too.

Here is the link : #-Link-Snipped-#

Try using it and share your opinions here.