Quest Software released the 6.6 version of SQL Navigator. Mainly it corrects some bugs.
The most usefull new feature is in the history search (where you can search the runned scripts/commands for an expression) to filter the commands by type.
Check the Release Notes and the Known Issues List.
It's was 23st in November last year.
It was in 13th in 2008 and 2007 in the same month!