We currently post all our video projects for client review on
our web site as mpegs. I was considering going to flash video
mostly to be able to post 16:9 aspect ratio videos.
However we can export a high quality 320 X 240 mpeg of a 5
minute show from FCP using compressor in about five minutes. The
same thing using the FLV exporter in Quicktime takes about 2 hours
to get a video that comes close to the same quality.