While there are many websites if you search it, for me i recommand StreamFab YouTube Downloader.
It can allow you to download not only videos of Youtube but also other plateforms like facebook, instagram, etc.
dvdfab.fr/youtube-video-downloader.htm
You can use a tool to download videos on YouTube-NoteBurner YouTube Video Downloader. The program has a fast download speed and can download all YouTube videos.
There are plenty of websites that let you download YouTube videos. Just Google "Download YouTube Videos" to find them.
YouTube would be my best answer. Using Internet Explorer use RealPlayer to download any Commercials you can find.
With youtube
There are lots of options. For starters, you can find whichever commercial you want on youtube then copy the link and paste it on keepvid.com in order to download it.
You can find sears commercials at youtube.com. I dislike helping youtube because I am creating my own video website, but youtube has sears commercials.
You can watch Coke commercials at video hosting sites such as the popular YouTube. Most, if not all, of the coke commercials will be available to watch there.
YouTube
youtube
on youtube...
If you are using Google Chrome, you can go in to the Chrome Store and download an AdBlocks, I am almost sure it blocks YouTube commercials too
You can download YouTube videos using this videopower.me/tips/ct-download/download-youtube-videos-automatically/ It has a converter tool too so you can convert the downloaded youtube file to psp compatible format.
you can see it here: http://www.sambisbee.com/cingular/ it can be downloaded from youtube - just do a search for cingular commercials
You shall not download any Content unless you see a "download" or similar link displayed by YouTube on the Service for that Content. Unless a download link is present for a YouTube video, it is against the YouTube Terms of Use to download videos/soundtracks from YouTube.