haa Mpg is the best cross platform format. I prefer Mov myself, but i use macs so it works flawlessly, PC people have troubles with it at times. AVI's are no good on a mac at all.. always come out jumpy, and there is really no good programs for the Mac to view. always use Mpg if you want everyone to see it.

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Hexagon, Carrara, Sculptris, and recently Sketchup.