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Its a nice feature you got there. Have you thought about creating permanent links? Are you going to blog on how you made it?

I do not think permament links on this would be a good idea simply because of the far smaller number of combinations.

Indeed, although namespacing permanent links would be doable, it wouldn't make much sense and other URL shorteners would do the job.

Permanent links for paying accounts perhaps?

That's one of the ideas :)