Very bright, very happy and a windows XP default background image in the thumbnail. Yeah,....ok, let's go:
The "box" is too small and looks a bit crowded. I'd enlarge it a bit, make it easier to look at. Interesting Image division: it's 2:2, 2 google adsense spots and 2 site related spots. In this case, in terms of site presence, google wins the fight. Unless you want to deliver the idea that this is all about google adsense, reposition the adsense spots. bring your upload box into the middle and make sure that its the focal point of the site. What are the incentives for users to upload? Right now you're one of the many that offers such a service, why should a user go with/through you? Do you have a spot in place where the most recent uploads are going to be in the spotlight, until they are replaced by a newer one?
Deliver interactivity, not just a box on bright background. Center your efforts in the presentation towards the target group you're catering to; social networkers, etc.
you're on the right track, the url is a match, even though the ext. is not favorable, yet not half as bad as others i've seen. A few repositioning efforts, some added activity and you're set. :wave: