Has anyone implemented/hacked digital downloads?

Hey y'all,

As this is not a core feature has anyone come up with a workaround?

I personally have looked at integration with the excellent Download Monitor:


Other options I've looked at are:

As well as off-site CDN links (Amazon)

This: http://wordpressapi.com/2010/11/22/file-upload-with-add_meta_box-or-custom_post_type-in-wordpress (Seems a bit backwards but works)

And finally some sort of email url system similar to how e-Junkie works.

All are a little bit too "hacky" for my liking so I thought I'd see if anyone else had any better ideas?