I need a PORTABLE video downloader that fufills the following:
1. It can be carried on a USB drive, so no extra programs need to be installed (e.g. media sniffer requires winpcap, web downloaders require java): It needs to be stand-alone.
2. It can download from most websites without problems.
3. It can download in many different types of formats
4. It is compatible with different operating systems and DIFFERENT VERSIONS of those operating systems (Windows [xp, vista, 7], OSX [Lion, Snow Leopard, etc], Linux, etc.)