Chosing an AJAX toolkit

During the summer I have started playing around with dojo an "Open Source DHTML toolkit written in JavaScript". There are four reasons why I choose dojo instead of other AJAX toolkits. First, dojo seem to have a wide support via its dojo Foundation where for instance IBM and Sun participates. Second, is developed in an open manner and is open source. Third, by technical merits, it's packaging system and the availability of quite a large amount of different libraries are beneficial. Fourth, the gfx library allowing cross browser 2D graphics is of special interest to me.