You can set your preferences to display a preview of each nanoref.com URL before you get redirected to the destination URL so you know where you are going before you are sent there.
Indeterminate URLs
You will always get a different nanoref.com URL, even if you enter the same destination URL as somenone else. This way you can track your stats separately from anyone else's.
Partial domain included
Up to 10 characters of the domain of the destination URL are kept to give users an idea of where they are going.
File extensions kept
E.g., destination URLs that end in .pdf will result in nanoref.com URLs also ending in .pdf. That way, you have an idea what your getting yourself into when you click on the nanoref.com URL.
Path forwarding
Anything added at the end of a nanoref.com URL (must start with a '/') will get appended to the destination URL.
Perl API on CPAN for programmatically generating short URLs
WWW::NanoRef
Subdomains
You can choose a subdomain to go in front of nanoref.com that will redirect to your chosen URL.
Statistics
URL history and click through stats for registered users.