Even if Dropbox is taken down, the files are still available locally on the guy's PC, so he can reupload elsewhere. Problem with broken hosts is the originals are probably goners as well.
I don't see Dropbox closing its gates any soon, though. Oh, and you get 2 GB space, which is more than enough, and you just have to save files locally then grab the public link to post.
By the way, you can get 250 MB for each referral, too... here's mine (shameless plug, sue me):
Moreover, Dropbox also features shared folders, which are great for team projects.