Services like KeepVid let you to save an FLV from it's website.
VIXY goes a step ahead and lets you submit an url then they convert the video and download the converted file automatically to your hard drive. VIXY allows you to convert a Flash Video FLV file (Youtube movies,etc) to MPEG4 (AVI/MOV/MP4/MP3/3GP) file online. VIXY is using a compressed domain transcoder technology and converts FLV to MPEG4 faster with better quality than a typical transcoder.
