Hey IsLame, it's actually quite easy to download YouTube videos without those external services.
You just have to bookmark the following "URL" (JavaScript code), and when you're on YouTube watching a video, you can just open this bookmark from your browser menu.
(Note: I had to split the string like this: 'h'+'ttp://w'+'...' because the forum software screws up the code and inserts [url] tags.)
I will make this easier for everyone and include a shortened link to these download URLs in the info box of Hassan's videos which I have uploaded to my channel. I have the three videos you mentioned, just be patient for a few minutes until I have created these links. I will post them here.