Just updated the grails based pastebin.
I got fed up (read embarrassed) by the autogenerated URLs. They were simply too long as it was using UUID to generate the URLs.
So - I generated a nice new function that will generate a short (3-10 chars) random string of upper/lower case letters and numbers.
This also allowed me to have a "short url" function (similar to tinyurl etc etc) without too much extra work.