I think my next photographic type purchase is going to be a Canon ST-E2 I spent reasonable sum of hard earned dollars on my 580ex II last year. But having the flash affixed to the top of the camera is kind of limiting, so the flash hasn't seen as much use as I had originally thought I would.

The ST-E2 may not drastically increase my flash usage but then again it may. I've already have a few ideas for shots in my head. There is also a possibility of planned type shoot where it could be handy coming up in the near-ish future.