I need something to cut some songs and youtube vids down to short clips to use for a class presentation in powerpoint. Something free or a trial version is preferrable obviously.

well i know all of the you tube videos are in flash format so you'll need something that can work with that, but other than the crappy windows video editor i can't think of any where theres a free trial that lets you save.
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download the youtube videos with a program (free ones for firefox are out there...)
then take the files and import them into Windows Movie Maker.
edit the audio and video and then save it to your computer though the tasks menu.

youll have a file that should be able to go into powerpoint