[asiekierka]

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

[_chendo_]

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

[davelocity]

Permanent links for paying accounts perhaps?

[_chendo_]

That's one of the ideas :)