This Portal fan made short film titled Portal: No Escape by Dan Trachtenberg, took more than a year to complete. That's a pretty long time for only 7 minutes of action, but it looks like it all paid off because the finished result is pure awesome and only shows that there is huge potential for a big budget Hollywood Portal movie in the future. I know I would hand over my money to go see a Portal movie made into a blockbuster.
This Short film was entirely shot and edited right on the iPhone 4 using the new iMovie App for iPhone. It really is incredible and it took the makers behind this short film 48 hours to complete. Of course in order to get very stable results, the short film makers used custom camera dollies with the iPhone 4 mounted on. This short film really shows the full potential of the iPhone 4's HD camera. Note: To view this in HD, click the source link below.
Source Michael Koerbel