Some time ago while trying to export a movie I made for the Web I had a problem. How can I easily know pixel sizes for my movies without screwing the Aspect Ratio. Well my friends and I have made iAspect a program that will do basic aspect ratios for you so you don't have to hassle with annoying apsect ratio calculations, it may sound odd but I've found it can really help.
In Addition to the basic Video Format and Aspect Ratio calculations, iAspect can calculate the Max Resolution you can make your video's at MPEG-4 or H.264 video for the new 5th Gen iPod. This new feature has helped me so many times when I was trying to figure out how big I can really get my iPod videos to the max resolution.