Short URL

Twitter To Begin Wrapping All Links With Official t.co Link Shortener
What Happened To bit.ly's Market Share?
URL Shorteners: Which Shortening Service Should You Use?
Social Media Marketing Tools: 11 Best URL Shorteners

The Curse of the URL Shorteners: How Safe Are They?
Most Used URLs Shortener on Twitter, January 2010
Using Bit.ly for Spying, Link Building and Happiness

Five Best URL Shrinkers

URL shortening services on Twitter
Shortening URLs

TinyURL custom alias
* bit.ly custom name, login, subdomain, Twitter
* zi.ma custom, login, going down?
* Snipurl nickname, login, private key Snurl sn.im
ow.ly has its own frame
is.gd
Sniply account, no free custom name, redirect page

10 Online Clipboards for Easy Text Sharing 2009
5 Tools To Escape The 140 Character Limit Anywhere 2011
fast online note notepad clipboard
Free Text Host too small, anonymous, no login
Short Text can have a private key
* Friend Paste large area, can have a password to edit or view
textsnip account
* cl1p.net URL, large writing area, create text, read once and gone
* kl1p.com more features
JustPaste.it HTML, not fix-width font, account, premium

budurl not free
URLcut url name, password
Metamark nickname, secret
doiop keyword
6url alias
myurl.in custom alias
HyperURL private service, shortcut
notlong sub domain
dwarfURL password
shorl password
digbig login required
RURL research
url(x)
kurl.nl not English
SHurl.net login required
shortText

dead:
Cligs cli.gs login problem?, rename clig (custom name)
Link Gateway System link.gs login
tr.im
url123
URLCutter custom, login, ADs
301url alias, password
* short.ie custom, tracking

unavailable:
urlTea
Tweet'l
link.toolbot