We often sit around and think about the woefully low number of platforms one can enjoy Portalon. (Or at least a facsimile thereof.) Thankfully, we can scratch two off that list, as this fan-made tribute to the game -- built using the Unity 3D engine -- for the iPhone/iPod Touch looks like it's sweeter than the moistest of cakes. We'd keep going on, but then you wouldn't be watching the video past the break. Which you totally need to do, like right now. (Unfortunately, we can't say the same about getting your hands on the game, as it's purely for show -- at least for the time being.)
[Correction: When it was originally published, this post referred to the Portal tribute project talked about above as Portal: Prelude, which it isn't. Portal: Prelude is a fan-made mod for the original Portal which was given Valve's blessing. You can read more about it -- and even download the finished mod -- from its official site. Sorry for the confusion!]