The shortest, 3-letter URL shorteners - The Definitive List

Welcome j.mp, a new 3-letter shortener "powered by bit.ly" and the 8th addition to this list, as well as re.p.ly (promising near real-time tracking of comments in social sites regarding the shortened URL) and now also the russian 0.mk:

1. 3.ly
2. z.pe
3. u.nu
4. a.gd
5. a.nf
6. r.im
7. l.pr
8. j.mp
9. p.ly
10. 0.mk

See my earlier post on URL shorteners for criteria on choosing the one to use.