If you want to import drawings into Synfig, but have them scale without pixelating in an animated video, there's a free program called Inkscape that could convert images into vector graphics and export to the Synfig vector format.
I use a couple of different pieces of editing software VideoRedo takes out the unwanted bits from pre-recorded video (ie: commercials, etc)
Xilisoft Video Converter can do a lot more than just convert video, it'll strip audio, create watermarks, etc. You can also use it to make a slideshow
You can also do some amazing stuff with Apple's products as well. This was put together in about 5 minutes on an iPad (not that it's anything close to the op's quality), and I'm pretty sure others could have put better together with simpler devices
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