There's a good discussion here:
http://physics.stackexchange.com/que...obular-cluster
The writer concludes that you would have something like 1000 times more naked-eye stars (> Mag 6) than we see on earth, but the night sky would glow about 3 orders of magnitude brighter than a badly light-poluted urban sky, so I'm not sure how many you would actually be able to see.