This looks like a great idea! Though, are you sure there weren't any free available 3char domains left in the .org section? Or any dropped ones?
Well maybe there weren't, and now that you have this domain it's better you use this one ofcourse.
Some cool things you could do:
- Make a deal with Twitter to also use your website when long URL's are posted.
- A 'get-money-by-using-our-service' would be cool, not that it is a must, but it's possible that you can make money by using your website for URL's (See: Linkbucks.com - Make money when people leave your website! )
- Make sure the http://h3n.org/prn link, can be totally viewed (the url behind that shortened URL) can be viewed by FE. doing http://preview.hrn3.org/prn, this is a usefull tool TinyURL has.
About the features you mentioned:
- Looks good, that's what we want.. a bit like TinyURL.Com
- The shorter the better! (But please give an optional option to use tags)
- I'm ok with that.
- I'm mostly using such a services to shorten my url, not to track visitors but it could be usefull for your TwtAd service.
About the template, please don't make it a very difficult template, I always like the 'quick use' interface. Like PRcheck.nl - Check je pagerank! has.
Hopefully I've helped you a bit