Well this works on any site which has it’s videos in FLV format e.g. YouTube.
Step 1: Go to http://vixy.net/
Step 2: Enter the URL of your desired video inato the bar provided. E.g. http://youtube.com/watch?v=1ZmtinZvwdk
Step 3: Choose the format (with the drop-down menu) which you wish to convert to. E.g. AVI for Windows, MOV for Mac, MP4 for iPod/PSP or 3GP for mobile phones.
Step 4: Press Start (the big shiny button)
Step 5: Wait. I believe your download starts automatically but if not look further down the page and you will be able to download your newly converted file.