Here I'm entering the tag active-directory
...
Type activ
alt text http://alexangas.com/blog/wp-content/uploads/2009/08/entertag2.png
Type the letters -dire
to differentiate from activerecord
alt text http://alexangas.com/blog/wp-content/uploads/2009/08/entertag3.png
Press TAB and wrong tag is inserted
alt text http://alexangas.com/blog/wp-content/uploads/2009/08/entertag4.png
Possible resolution: When pressing TAB a match against the currently entered text should be made.