I have a full video editing setup here (matrox, premiere pro and all the tools, monitors, tape drivers, yadda yadda). Don't let anyone kid you - video editing is a royal pain in the ass, only made fun by the fact that you get paid for 90% of the time doing nothing mroe than watching tapes load and write.
For your conversion issues, the problem is quite simple: WMV is a compressed format. MPEG is all it's various forms is a compressed format. When you go from one to the other, you are getting all the compression artifacts from one, and then adding the second set on the top. That tends to make for REALLY crappy looking stuff. As you compress more, the artifacts become more noticable (especially if your movie has solid color backgrounds or similar stuff). More important, the decompression and recompression can often lead to not only adding more artifacts, but in fact amplifying the existing items.
Sorensen is nice. CleanerXL is decent. It's all good.
You might also want to consider recompressing the entire piece and then using a chopping tool to cut it up at the end. The compression will happen a slight bit faster.
Alex
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