I use mediafire too, but either name my files with random names, or zip them into folders with cryptic names. I think unless you take the piss and upload loads of *insert names of whoever is in the charts at the moment* files, blind eyes are turned!

I like mediafire because people who don't have an account can download stuff without jumping through hoops and closing endless popups.

Also, you can create loads of subfolders to help you organise your uploads.