For the author of Superfish: I just found a small bug in Superfish that leaves a submenu open in special circumstances. Steps to reproduce the bug - the description would be easier if the example menu items were all named differently :-)
1) go to http://users.tpg.com.au/j_birch/plugins/superfish/#examples - basic style; 2) mouse over the second sub-item of the first menu item, so a second sub-menu opens up; 3) tricky part: leave the second sub-item of the first menu item from the left, and from the left enter quickly the first sub-item of the first menu item; the second submenu remains open indefinitely if you don't move the mouse furtherly. Thanks a lot for your work with Superfish, and I apologize if this bug was already known.