Check these sites for now:
www.klubid.ee (estonian only,but google translate helps)
www.tallinn-life.com
www.inyourpocket.com
rada7.ee
kuhuminna.ee
This seems to be another interesting portal for visitors:
www.traveller.ee
Going out and getting around in Tallinn
Manchester: More daytime & evening entertainment
Tips from a bouncer:
Marble Arch apparently the pub of a brewery. A bit away from “student mainland”, but maybe when you are around in the north, you might want to have a look…
Briton’s Protection just the name sounds worthwhile. A old school pub, it seems.
Micron @ Joshua Brooks a small club in the premises of Joshua Brooks. Seems decent and affordable.