I just think the same as you with the YouSendIt, they really did not come anywhere. And these sites(mention above) are only online as it is right know.

It just men there is slot of filetering sites, like rapidshare, megadownload, and i could go on forever, so why are these websites getting funded, when there already are tons of filesharing sites and app free. And filesharing is not that complicated, upload -> store -> share.. But as mention above, they are properly trying to be the hun for other programs.