[quote=Aristo]
Would it really be feasible to arm airships like their sea-going counterparts? Having to stay airborne, they'd have a much less-stable platform for firing, and that's a ton of weight to keep in the sky.
[/quote]

Machines-guns for anti-air purposes could work. Aside from that, I think only bombs would be feasible. [url=http://upload.wikimedia.org/wikipedia/commons/8/81/German_airship_bombing_Warsaw.JPG]The Germans did it in RL.[/url] That's a painting of a German airship diving over Warsaw to drop bombs down on the city.

EDIT: I agree with the rule of cool scenario though.