I've only heard from two universities, and I'm pretty sure I only heard from the second one because I took the initiative and arranged a meeting with one of the professors (don't think this typically works though, and I have heard some people have had this blow up on them). Have to have an answer to the school I got accepted to by the 15th of April, and starting to wonder when the rest of the decisions will arrive, so I don't limit my options, but also don't keep the school on the hook for too long!
1 and 1 so far...here's to 50%!