Nowadays you don't need a software installed on your PC or a plug-in for your web browser to download YouTube videos direct to your PC, PSP, Mobile or iPod. That I just know after I was introduced to a web site that can convert YouTube videos into various video formats like .flv, .mpg, .mov etc. for download. It can even convert the videos into audio formats like mp3, mp4, wav etc.
The site I'm referring to is http://www.captureYouTube.net/
In the field provided at the site, just specify the URL of the YouTube video that you want to download. For example: http://www.youtube.com/watch?v=L2GaCnAiuvo
After that, select the format you want the video to be converted to. Next step is to click on the 'Convert and Download' button to begin the conversion. When the conversion is completed (usually after 3 seconds), you should see a message that says: 'File Converted Successfully. Please download the file from below'. Click on the 'Download' button to download the converted file.
It's the best find for me this year and the best thing of all, the service is free. There is no charge and registration involved !