Given the fact that there are too many proxy sites out there as it is, your site looks a bit different, the iframe isn't a bad idea at all - big point there, especially since it's movable.
The rest of the site is as expected and is the current cookie cutter approach for proxy sites. Maybe you can use your innovative thought process on the site as well and step it up a bit, delivering something that helps you to stand out from the crowd.
Other than that, colors, functions, etc. all works well. :tu: