5: Miro - Open Source Internet TV - A little rough around the edges. Think of it as an unrestricted iTunes for video.
4: HandBrake - Open Source DVD conversion - "Backup" your DVDs to AVI or MPEG 4 and watch them on almost any media device. I just watched the Godfather trilogy on my phone.
3: Bean - Really Nice Word Processor - Rid Microsoft Word from your life forever.
2: Gimp - Image Editing - Save yourself a fortune by not purchasing Photoshop. Or a lot of hassle by not stealing it.
1: Copernicus - Image Grab - Grab anything you like (including video).