While I think dojo.gfx is a great idea, the javascript alone to run these are well over 150KB. Granted this isn’t too large compared to all of these javascript based frameworks that more and more web sites are using are making it harder to use for someone who is on dial-up or just wants the content.
So many web site are using all kinds of ajax scripts that have no real purpose, I do think that there are some good things for it, but when people can no longer bookmark the page they are looking at or send a link to someone this degrades the functionality of the page.