A few weeks back I was looking for a Javascript or HTML5 implementation for those bitly style "copy URL to clipboard" function. It just doesn't exist without flash (except in older versions of IE)! There are --webkit only implementations for grabbing things from a clipboard but not for pasting to it and I thought the former was more of a security issue.
Another thing I noticed is a smooth flash animation on my low powered Netbook looks like a jitter mess when implemented in canvas.
Until these issues are resolved, sadly flash isn't going anywhere soon.