Well I suppose we could do a sticky 'free stuff' thread on the forum.
You could add a 'free stuff' page to your website
Maybe somewhere like graphic river, they do do free stuff.
You've got file silo's, but wouldn't use that unless you've got limited bandwidth
How are you wanting to post the tutorial as that will likely determine the best option, if for example you're adding a tutorial page then the easiest option would be a link directly from your website (ie 'click here to download resource files') which allows them to save stuff to their own pc, but I wouldn't advise that if you've got a limited amount of bandwidth on your hosting.