For macos users, doing it with iMovie it's terribly painful because adding video, imovie starts eating all my disk space.. in seconds. I have only 1GB now, and it's gone like after only 10 seconds of video. I guess i'm going to have to leave the iMovie idea alone and just do slide shows in IpHoto, with music of course. OR i can arrange the music with sound effects in imovie save that as a music file and then import that music+soundeffects into the iPhoto slideshow.