cnc pls : http://www.filz.us/view/e80fed5f-1f3/

It looks pretty awesome actually. Would be even better with the grey cloudy things inside of it.
I wonder how you did that onion skin appear on your anim ^^

It looked pretty cool, but the transition from a solid cloud of smoke to it disintegrating was a bit too sudden. Smoothen that out and it'll look even better :)

It looked good for a one toned explosion but if you wanted it to look more realistic, you should add some inner particles like these:
Oxob and Dan mark have good tutorials on this

The explosion part was too slow, use less frames. Also the direction where the smoke was disappearing doesn't make sense, the smoke was going up than suddenly some part started disappear straight to the left. Also it disappears too fast, ease it out.

thx 4 cnc guys , if can show me somehow pls do it , i didn't animate for a long time so i kinda need some examples :D