Check out my new project: urlB.org (pronounced "URL Borg").
It's like tinyurl.com, rurl.com and many more services that create short URLs that are much more manageable in SMS or emails. I just want to "do it right", I feel other services leave much to be desired.
Here are a couple of things that stand out in urlB.org: - If you are a site owner, you can tell when a page of your site is "urlBorg-ed" by looking at your logs. - If possible, a cached version of the page that was urlBorg-ed is kept. This is useful if the page is moved or changed and you can't find what you linked to in the first place.
If you are a developer, have a look at the developers page.