This is a meta comment, but I think we should shy away from submitting any kind of short urls. They are bad for the web and obfuscate the story’s domain.
On topic, I really like these daily services that don’t require me to log in and check a website. One email, every day, and that’s it.
I was about to write something to expand short URLs upon submission, but it looks like in this case the short URL is actually useful, because what it points to is not memorable.
Perhaps a mix of both? You could show the short URL if it was submitted with one, but link to and do the duplicate checking with the URL that a short URL points to.
I like the idea, but a weekly digest would be preferred over a daily for me. This is a good way to discover great projects.