Scratch

For starters, the flag and the stop sign look very amateurish.  I highly recommend creating an option for removing them, or giving them a sleeker style and placing them on the bottom of the frame so that they resemble the controls found on most media players. 

I love that I can embed projects in my moodle courses, but I hate the way it makes the page look.  I imagine this is a problem for many people who want to use scratch on their own websites.  Making that wrapper less obtrusive would enable people really use Scratch as a tool as well as a toy.