If you want to download online streaming videos to your pc, you could try vconvert.net. A very simple (and pretty) dialog box awaits you there. You enter the URL to the video (like a youtube link) and then check off which conversion you want to download. One nice thing that I found useful is that they will provide an audio (mp3) version of a streaming video. Many times there are presentations and things that I find interesting, but I end up wanting to listen to them in the car during my commute instead of watching them. I could always do the conversion to extract the audio myself, but this might prove simpler. It appears to be free but I believe they offer up a 3x speed increase with a paid version.
The conversions available are .wmv, .mov, .mp4, .3gp, .mp3 and .flv. I tried it with a couple of our Inkscape YouTube vids and it seemed to work flawlessly - I've only tried the mp3 and flv conversions. But of course, as with just about everything online, you spins the wheel and takes your chances. ;)
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