Most editing software will output to Flash, QuickTime or Windows Media Player. I think Flash is the most supported format. I'd start with 15fps at 360x240 (or whatever the widescreen equivalent of that is).
If you mean, "anamorphic", that refers to a process that allows use of the entire frame of video film to capture a widescreen image, instead of letterboxing where you lose resolution, so this doesn't have any relevance to your display format.