Format Factory(or Google "Format Factory")
I'm not sure if anyone here has heard of this this program but I thought I would share. It's extremely useful. I honestly feel that it should be on every computer.
Basically you can take any file and convert it to almost any other file. I say "almost" because of course it doesn't make sense to convert an MP3 into a JPEG.... but if you need a video in another format, or audio in another format.... you can even convert a video to audio if you just want the audio from it. You can even create ISO or CSO image files and you can burn an image file to a disc. You can combine multiple audio or video files into one single file.
It's completely free too and it's updated pretty frequently so you can install the update with any fixes/improvements.
I used to use it a lot with songs I bought from iTunes a long time ago. First of all they were much larger files than they needed to be (almost twice the size!) and second when I would burn an MP3 CD to have multiple albums on one disc for my car (as a backup disc for when I forgot my iPod). I wouldn't be able to organize them in folders through iTunes but because they were protected I couldn't burn them with anything other than iTunes. So I'd run them through Format Factory converting them to MP3 files which would greatly reduce the size (but they were still perfect quality) and also removes the protection so I could burn them with the standard Windows explorer. It also cleared a lot of space on my iPod by replacing purchased songs with the new converted songs. Started to make me wonder if it's a trick of Apple's.... make the song files twice as large as they need to be to make people think they need a larger iPod....
Anyway, I've also been using it to convert video clips I download into 3GP files to keep them small and they play back on my Moment with no problems. They look great too.
I highly recommend you check it out! It's a pretty small program but it's extremely powerful. You'll likely find MANY uses for it too. It has a very easy to use interface too.
If you get it (or already have it) let me know what you think of it and what you've found it useful for!