Media-Convert is 100% free. No software is needed, and you don’t have to register. You only need your favorite Internet browser. Your files are ready 7/7 days 24/24 hours. You can convert files up to 150mb in size.
I myself have used media-convert a number of times and its a great free service. There are no limitations in it except the file size limit, which itself is more then enough. I have used some free converters but they always have some sort of a limitation, be it time limit of video file or very limited amount of size. This online service surely beats any application that I have tried and I will recommend that you try it out as well.
Advantages of Media-Convert:
1. More secure because you do not have to install software on your computer, which can contain viruses, spywares, etc.
2. You can access it anywhere from around the world using the internet. You can use Media-Convert at the office, in a cybercafés, or with your friends PC, and then download the result quietly to your mp3 reader, cell phone or any other hardware.
3. Supported Video/Audio Formats: 3G2 3GP AMV ASF AVI DV FLI FLV GIF GVI MKV MOV MP4 MPG OGM RM SWF VOB WMV + video presets for Windows, Linux, Mac, SVCD, DVD, Pocket PC, Mobile phone, Nokia 770, Nokia N800, iPOD, iPHONE, Sony PSP, Nintendo DS, Wii, Zune, S1MP3 MP4 player.Google+