Google has some amazing tech videos at their site by the user Google engEDU. And they even allow for downloads which is great for me.
But I prefer downloading files using wget to be able to resume downloads later. You can't just wget the video link url's as is because they have & characters which cause wget to try to download them as separate files. Instead try something like this for the "OSS Speaker Series: The State of the Linux Kernel" video..
wget -c --output-document=MortonLinuxKernel.mp4 "http://vp10.video.l.google.com/videodownload?version=0&secureurl=twAAAOFdafTKyCsBI7E0BCCT6060NjqUP0-3g9pfM0xl5X1YO8a1zhU5ArUNYf8PLb44VqTIrTR2hntorTVWAEL6bqWkChEIIVPqNeHV5F4PRqoHXwlvZRC0_giNoVtliPIDsfE7zAzQSPok2b8ShvvgxJVI3T3WoPwGtr6Vvmwfjj18i9wTbaZD_JGXpTjD2kJrvVIenN5CSTRBbXYMKR49YyVYLdRNu9BuY924qZaDV4zEd9YFUsoCP42JkguszqVlOg&sigh=hEHjkZDlhZrMiZnAQrs8O55mFdo&begin=0&len=4897661&docid=1742374580386548257&rdc=1"