Careful with the coffee grounds. I was bringing home grounds from work for my worm bin, and after a couple of weeks it started smelling like ammonia. This was only with one or two pots worth of used grounds every other day. I was still putting in cardboard and whatnot as well.

Now, I only put work grounds in once every other week. The rest go somewhere else around the house.

Don't forget the Vermiculturist's mantra:
Moderation...diveristy...patience.