Good open source Video Editors? Sure, I could Google and find random software. But I rather have the opinion of users that have had hands-on with any open source video editors.

So if you've used one that you like or know of any, please let me know and state whether you've used it or just know of it (and heard good things). Thanks.

I'm looking for Windows software. But you may suggest Linux as well for other people that might stumble upon this.
VLMC is a non-linear multitrack editor. It's based on VLC and inherits a pretty vast format compatibility from that. The UI is a little rough, but it gets the job done.

Lightworks is a more recent project and seems polished. It's rooted in broadcast editing, so a large number of familiar codecs are unsupported. It supports Matrox codecs, which you have to install separately, so you'll have to convert your video to Matrox AVIs first.

Avidemux is a simple editor, good for trimming and small tasks. In my experience, not very stable on Windows, OK on Linux.