Hey Guys!! I have found a Very easy way to convert your videos for MiVtones without any special programs!
Simply put the video in iTunes then right click on the file in the library and select "Create iPod or iPhone version"
when this is done converting a copy will pop up right below the original. drag that copy to your desktop then SSH it over to the MiVtones video folder. When its done it works.. I just started using Mivtones today and tried to find an easy way to make it work.
as for those trying to SSH with the iPhone 3GS after many threads & tutorials and no luck I came across this one which was the easiest and the only one that worked!!
Getting SSH to work on the iPhone 3GS | Apple iPhone School
*note i did this using Cyberduck on my mac but my drop down was set to SFTP (SSH File Transfer Protocol) instead of SCP like the directions called for and that's what worked for me.