From Download Squad:
What could be better than a program that will convert audio, video, and image files from and to just about any format you can think of? How about one that does it all batch-style with minimal clicking? FormatFactory doesn’t care what files you want to swap in what order, just feed it your sources and watch it go to work. Unlike a lot of similar apps, this one doesn’t limit you to only video or audio, or even to one file at a time.Dump in as much as you want of whatever you want, and FormatFactory will do all the heavy lifting. It even supports the iPhone and PSP, and 3GP as well – making it a great way to cram multiformat goodness onto your favorite portable player.
This posting is from almost a month ago, and I finally got around to trying it last night. It’s great! It converted a video for me in just a few seconds. I also tried a WAV to MP3 converstion and it only took a few seconds as well.
None of the download links on the site itself worked, so I did a search for the program and found it easily.