Here are my thoughts:
* Slow load time (I'm located in Europe)
* It's not clear what your startup does. At first, I thought it would be something using Amazon S3 because of the name "s3mer". The "What is s3mer?" section is also very unclear to me.
* Why the Adobe Air, Mac, Windows XP and Windows Vista logos? If it runs on Air wouldn't it also run on Linux?
* The "Change Language" overlay is blinking when the site is loading and displayed by default (WebKit nightly ;-))