Strobist Water Drop

http://scienceblogs.com/photosynthesis/2009/11/when_fluids_collide.php

http://scienceblogs.com/photosynthesis/2009/11/holy_water.php

http://scienceblogs.com/photosynthesis/2009/10/so_a_bullet_runs_into_an_egg.php

and a very large collection of images on Flickr of this stuff
http://www.flickr.com/search/groups/?q=strobist+water+drop&m=pool&w=71917374%40N00