Prior to attending my daughter's dance recital, I had never ventured into ISO 400 land.
My external flash was doing nothing for me and it looked like movies were all I would get from the event.
I was truly amazed how well the images turned out with very little light at ISO 400.
Granted, at 100% they are hideous, but after a quick pass through Neat Image and a resize for the web, Presto!
Better images than I could have hoped for, given the conditions.
ISO 400 IS an option for me after all.