A good improvement from my first shoot I think. Better lighting, composition, etc, etc. I'm not 100% about the background, but it's different from so many of the other high-speed water balloons on flickr.
From my second shoot with my new digital sound trigger. A bit more thought to composition and lighting this time round.
Strobist: SB800 on camera left, SB600 behind subject with plexiglass diffusor. Flashes on 1/64th power.