if you're only sending to one recipient we have that feature in (you get file downloaded green message on the top)
if you have multi recipient that's a more complex ui problem that we're thinking of...
Thanks for the feedback
Maybe I'm just not in the target group.
Like djim said, storage space and bandwidth are non-issues.
May I suggest trying to get Sharefest popular within a niche? You may have to adapt to that particular niche, but I think it'll help you a lot.
I think there's something in your product, but it doesn't have any selling points for me. Even if you make it as good as Dropbox or any other service, I won't change. For that, you need to be better than existing solutions.
Either be better or be different. Generic user facing file sharing - been there, done that.