Nor did IE4 doing its' own thing' date=' hurt MS ... but it hurt us developers.
Stefan[/quote']
Let's not forget the customers/clients. In the end they are the one that pays for all this.
I think there may be a slight difference here in that supporting different video formats is (I think) easier than supporting browser quirks. On the web front it means providing access to different versions of the video file (flash, quicktime, etc...). On the content production front it means taking the extra time to spit those files out from your video editing software or converting files. I admit it's extra work but I think it's worth it when the pay-off is a competitive eco-system for video formats and preventing another monopoly situation a la MS Wndows or Apple iTunes.