Rick Segal reviewedIdeoneCompile and execute code online in 80+ programming languages
 Recommended
Pros: 

Dead easy/fast place to quickly check some code.

Cons: 

None I've found.

For a quick, I wonder if this can work, I really love this. Just easy to fire up, check it, and off you go. Really well done.

Rick Segal has used this product for one day.