I've been happily using VLC and Quicktime, although I'd love to have a program that can manually alter the aspect ratio of a video (whether it be a divx file or DVD). I have quite a few TV rips I've downloaded that are either 16:9 video squished to fill a 4:3 window, or are 4:3 videos stretched to fill 16:9 windows. I'd love something that can alter this on the fly to restore them to the correct aspect ratio. On my PC I had a program for my TV Tuner card (Dscaler) which could alter the aspect ratio, and that was fantastic.
Another thing, I'd love to be able to zoom. I have a few DVDs of TV programs that have a 16:9 letterboxed picture (West Wing R2 boxsets). This is really annoying on my 16x10 LCD monitor as I end up with a really small picture in the middle of my screen with black bars top, bottom and sides.
Is there anything out there (or maybe a plugin for VLC?) that can do this?