A few mobs who dont drop cash but should.
 

Puntar Sandfisher (North Ro) - looks like from several copper to 5gp but in small coins (lots of copper and silver)
a Smuggler (Qeynos Sewers) - No hard info here but the atleast dropped a few gold.. the occasional rusty weapon
a Mercenary (Qeynos Sewers) - also should drop a few copper and the occasional rusty weapon

Thats all I've found thus far.
6-23-10
a Ring Leader - Similar loot to smugglers. just a bit higher

Smugglers fixed, pending update.

The rest fixed long ago.

http://eqbeastiary.allakhazam.com/search.html?id=465

Tol Nicelot in erudin dropped 6p and change on live from day 1 still does as far as I know

Fixed, pending update.