Subcategories:
URL Redirection 
Services that redirect URLs one to another for shorter URLs or domain name forwarding.
1. BigLNK.com 
Url shortening and redirection providing for easy creation of short urls that won't break in when sent in emails, posted on forums or blogs, or sent as an instant message.
http://www.biglnk.com/
2. is.this.it
Free URL redirection service. Supplies a short URL to replace a longer one.
http://is.this.it/
Free URL redirection and web forwarding service with no advertisements. Supports url cloaking and path forwarding. Swaps a boring long URL for an easy-to-remember shorter one.
http://blob.in/
4. URL Kick
Free service to convert a long URL into a short one. Permanent.
http://urlkick.com/
Offers redirection services for using a short URL like http://ME.x50.us or http://ME.i50.de in place of a longer one.
http://www.x50.us/