Collaboration is easy – send the url to a colleague for them to comment on your work, or edit it and send you the updated version – code as conversation. Even versioning is supported- every change adds a number to the URL, eg. http://jsfiddle.net/ATFcS/1 becomes http://jsfiddle.net/ATFcS/2 when saved, so it’s easy to go back and review older versions – a brilliant touch.
When faced with a bug in a complex design, it can be hard to track down exactly what’s causing the issue. I’ve found it can be very helpful to recreate a simplified set-up in jsFiddle – if I can replicate the issue it’s then very fast to manipulate the code to find a solution.
So those are a few uses for jsFiddle – please feel free to leave your own tips and tricks in the comments.