box.net
and it takes too long to download a lot of files.
Unfortunately you can't link straight to a file on box.net without paying for an account, but the screen between the user and the download is very simple and looks nice, and most importantly there are no ads at all.I use it to host stuff, you can see what the download screen looks like here: http://www.box.net/shared/mlc0g8b9q1
You used sendspace for me, that site's worse than Mediafire.