I thought you might find these interesting, based on the discussion below.
There's a lot of information here, but both are very worthwhile reads, explaining what Catholics hold dear and believe about the Real Presence.
(Scripture Catholic is just an awesome site all around for clarifying - biblically, and with examples from the early Church - what Catholics believe.)
http://scripturecatholic.com/the_eucharist.htmlhttp://www.staycatholic.com/the_eucharist.htm