Flash Replacement

Flash is obviously dead/dying, but I still want to be able to write online games (complete with vector animations and all). I've been studying Javascript, SVG, and some neat stuff with HTML 5. However, I've found very little in terms of a platform to tie it all together. What do you recommend?

Desired features:
* Free as in beer
* Helps with image/sound resource loading
* Helps control animation in a standard way

Box2D comes surprisingly close except for the resource loading. But it would be pretty hacky to have all screens as 2d physics environments.

I just had a glance at the Gnash source code, and it is huge -- 4MB compressed! configure itself is 1.5MB uncompressed, and the rest of the source is spread over several dozen files in around a dozen subdirectories. The majority of the files have more content being the huge banner comment at the top than actual code.

Yuck.