In my last post I mentioned Mingle eats too much RAM thus slowing down the server. Another thing I would like to mention is that it has big learning curve; I better learn FLEX than learning MQL.
Acunote on other hand is simple (no story cards) solution to manage agile products. No learning curve and one gets started in less than a minute. Add stories (backlog), create sprint, create sprintlog and that's it.
It has a very good feature of tagging which can be used to tag stories to differentiate them as bugs, defects, tests, tasks, features, change requests, must haves, should haves etc.
On scale of 10 I would give
Acunote - 7
(no project velocity, no users other than current 5 can create defects)
Assembla - 5
(No relationship between Task-Defects, is on the lines of oDesk not agile)
Mingle - 6
(learning curve, complex)
