This will be part two of Short Links, IDNs and (WordPress).
lessn and shorty – standalone host-your-own short-url services
http://get-shorty.com/forum/viewtopic.php?id=21
http://www.subtraction.com/2006/01/17/get-shorty
http://www.subtraction.com/2006/08/24/announcing-s
lessn is very simple, you get one username / password and next to no interface – does have bookmarklet
shorty could give you multiple users (database allows for it); however, that part of the interface seems to be absent – +ve human-readable links; excluding backwards–s dot double–u ess 
Looking at http://yourls.org/ too, how many different schemes does one need‽
