Since the (death?) of 1-Click YouTube, I've been looking for a video down-loader that was simple, straight-forward to use.
Flash Video Down-loader fits that bill, for me. I've never had any problems with it. While I've used it at other video sites as well, the developer stays on top of the (endless!) tweaking YouTube does to their source code, and that takes dedication.
While there are other video down-loaders that offer more download options, I recommend Flash Video Down-loader to anyone, who just needs a video down-loader that doesn't require endless tweaking.
Works for the most part but sometimes fails to compile the final video and you end up with a corrupted main file and a _tmp_ folder with thousands of small .ts files. Is this a bug? If so, please fix! Also, no matter which dowload folder i pick it keeps creating _tmp_ folder on disk C: which makes Windows super slow and unusable during the download as it creates tons of small files in that folder.