I worked the whole day on better explosion sprites, this is what the explosion looks like now (including a crash of the playerheli for Toast^^):
http://www.youtube.com/watch?v=N6thyqJ1FIsbtw, Toast, you are may right with the falling down. But actually it doesn´t look wrong for my feeling, how it is now. The only thing I want to change is, that it doesn´t get too fast when falling from a higher position...
About the ground particles: I may have a look at it, but it is very simple as it is, and looks good enough for now.