I can never get over how truly amazing Ruby on Rails is. I was recently asked to create a quick and nasty demo application to showcase some of my skills. So, following the provided specs, I whipped up the following application in less than a day (of course, I spent a larger portion of that than I'd like to admit on user interface tweaks - I wish I had design talent).
Now, I'm not a graphic designer/illustrator by any means, but my coding is pretty good. You can check out the application here. It's a pretty basic file uploader with the ability to make files public. Also, the upload supports RTF and HTML in addition to plain text.