For this kind of site the design is not so important, but if you insist :P
The header is fine, the lack of content on the front page is a little strange. Maybe add further description, an image or even an advert. There seems to be a colour issue on google chrome with the footer. The footer fades to a darker black then the background. Maybe some sort of png fader would help fix this issue.
The speed is really great rapidshare.com came up instantaneously, I have no complaints here. (Europe).
Otherwise, good site! I'd recommend it as a proxy browser.