How Do You Make A 2.5 Hour Mix Into A Video File For YouTube?

Hey guys, I'd like to start posting mixes on a YouTube page I just set up, but I'm having some trouble with it.  I basically just want to take the mp3 file of my mix, put an image to it and make a video file out of it.  What programs are most people using to do this?

I know it can be done cause I see lots of mixes over 2 hours in length posted all over YouTube.  I downloaded Windows Movie Maker, but it only lets you do 30min videos. 

Any help would be greatly appreciated.. thanks!!