Attached Link: http://www.sparkyworld.org/images/gallery/fx_l_apache.jpg

Helgard has a free python script at VP, Phil C has a commerical one at his site, both allow you to explode a mesh in various ways. 

Powerage has a range of exploding buildings. 
Or you could try using Foresters water splahses and using them as "particles" of dirt.

All of these do miss one thing though - the dust cloud or the middle explosion bit - for that you need to postwork it.  I find Particle Illusion for that as shown in the image (given in the link above) is the best way.  

Pinky - you left the lens cap of your mind on again.