My father grew up Presbyterian, and he said that they use the little shot-glass sized cups for Communion. But yes, Catholics use the one chalice for the wine at Communion, and I believe that's the case in the Episcopal Church as well.
I know that it's got kind of an ick factor, but so far, I've not gotten sick from it. But if I have a cold or a sore throat, I skip the wine and just take the bread. And as for the bread question, most churches I've been to use wafers, but there are some that use a flat, round piece of bread that's been torn into tiny bits.
Oh, bravo, Beaker. (hears Don strike the keys) Hey, someone want to get Don an ice pack or something?