I am currently using a FireFox extension that downloads youtube videos. The format is flv. I need to convert these flv files to something else like AVI, mov, mpg....etc. I downloaded a program called Moyea Video Converter. However, it is going on 10 minutes now and is only 34% finished on a 6 minute video.

Does anyone have any ideas, or know of a better program that does this MUCH quicker?

See if one of these tutorials uses a program, that may be quicker:
FLV to AVI Conversion Guide
YouTube Google Download FLV to AVI
Convert YouTube, Google Video, etc Flash FLV to AVI/MOV/MP4 online
How to convert .flv (flash video) to .avi or .mpg