I knowSkim uses Mediafire. I u use Sendspace, others have used 4shared.com. There's also Yousendit.com too.
Mediafire has direct download links.
Sendspace I like for severl reason.
Firstly, 300 MB file size (for free acount holders) gives you around 2 hours of MP3 at 320 KBIt, which is what i record at. Also, I'm a huge fan of the wizzard, which you can view all of your remote files.
Sendspace and YouseYousendit send links to recipient's via email that they have a file avilable for upload. You can do enodamis with both Sendspace and Yousendit too.
There's I'm sure other e sites out there, but Sendspace and YouseYousendit are what I've used, prefering Sendspace.