DigBig 1

Features:
* Registration required to use their services.
* Free and never expires.
* To be used for serious work-related uses.
* It is not to be used to shorten URLs for the following:
- URLs included in spam mailings
- Adult-only sites
- 'Get rich quick' schemes or home-based businesses
- Click generators for online gaming
- Non work-related purposes
- URLs already shortened by other URL-shortening services.

The restriction by "work related purposes" only is enough to rate this site at the minimum.