Mixing TV/movie aspect ratios in Vegas and/or avisynth/Vdub

I posted a short note on how to mix TV and movie widescreen aspect ratios. It's Windows, Vegas-centric with an option on avisynth/vdub. It's not exactly rocket science and I'm sure the techies are laughing because I've done it wrong somehow, but thought I'd drop the link in case it helps, like, anyone. :D

http://obsessive24.livejournal.com/485603.html

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