If you have a long URL that you need to remember, check the following list of free short URL redirection service. These free web sites below can take a long URL and give you back a shorter URL. Since these sites forward a click from one link to another, they are also known as URL forwarders and some also do subdomain forwarding.

My personal vote goes to NotLong service. They don’t offer many domain name, but no registration is required. It’s the only subdomain forwarding service that doesn’t need us to go through the long registration and confirmation/approval process.

• MetaMark.Net - Path forwarding service. Have an IRC bot on several channel, which let you shorten URL while you’re on the IRC. Support bookmarklet for easy creation. Provide statistics if you register.
  Sample generated URL: http://xrl.us/g63v
• SnipUrl - Path forwarding service. Support bookmarklet for easy creation. Provide statistic if you register. Allow multiple long URL to be shorten at once (batch).
  Sample generated URL: http://snipurl.com/h26v
• TinyUrl - Path forwarding service. Support bookmarklet for easy creation.
  Sample generated URL: http://tinyurl.com/97cpl
• NotLong - Subdomain forwarding service. Support bookmarklet for easy creation. Provide statistics and allow you to choose your own subdomain name for the redirection.
  Sample generated URL: http://adsense-tips.notlong.com
• Short - Path forwarding service. Support bookmarklet for easy creation. Provide statistics.
  Sample generated URL: http://shorl.com/gyfugufrubramo
• MakeAShorterLink - Path forwarding service. Not allow URL that they think already short to be shortened. Hard to remember generated URL.
  Sample generated URL: http://makeashorterlink.com/?B5F8324AB
• ShortURL - Subdomain forwarding service. Many option for domain name available. Require registration and and must have approval before the short URL activated.
  Sample generated URL: http://adsense.2ya.com/ (might not approved yet)
• V3 - Subdomain forwarding service. Many option for domain name available. Also create redirection for your email address. Require registration.
  Sample generated URL: http://adsense.rulestheweb.com/
• GentleURL - Simple path forwarding service.
  Sample generated URL: http://gentleurl.net/XZZKK/
• MidgetURL - Simple path forwarding service.
  Sample generated URL: http://www.midgeturl.com/14
• ACBox - Subdomain forwarding service. Four domain name available to choose. Also handle search engine spider. Require registration and manual approval.
  Sample generated URL: http://adsense.acbox.com
• SmartRedirect - Subdomain forwarding service. Many domain name option available. Require registration.
  Sample generated URL: http://adsense.allhere.com