I've seen a handful of online list managers with a ton of powerful tools, but this is easily one of the simplest I've seen. Don't be fooled by its ease of use. [Ezine Director] packs a powerful punch. Give it a spin!
EzineDirector is much smarter and faster than what we use...
I think you're providing a marvellous service and I'm seriously thinking of swapping one of my larger ezines over to you.