Share 'Any tips for publicising your distro, beyond the obvious?'

Hello everybody. I started a zine distro about 2 months ago (Zinemonger). As the distro only stocks free zines I thought I'd be inundated with orders but in fact trade's been a bit sluggish. I've sent out a few flyers. I've also posted quite often in places like LJ and Photocopy Heart but am wary of overdoing that and irritating people. Any tips for boosting the profile of my distro?