Basic iMovie 08 Questions.

I have a late 2007 macbook with iMovie 08. I just made my first iMovie and I have some basic questions:

• I added music from my itunes to the entire imovie, and then I later added different music. Is there a way to delete the first music track? I see how to re-arrange tracks but I do not see how to delete tracks.
• I would like to export the imovie to YouTube and also save a copy to my iPhoto, which is where i store all of my pix and videos. What is the best way to export to YouTube and iPhoto?

Thanks