if it makes you feeling any better, I'm in the same boat. Gave them all the info months ago, and have been peppering them with gentle reminders every 2-3 weeks or so. The last e-mail I wrote was more clear, basically something like, "I got my application submitted earlier than expected, and at this point, I'm just about ready to submit all my materials--including the recommendations--to schools so they can begin to review my application. Please let me know if there is any other info I can provide you with to help make the process easier and smoother on your end."
I got guarantees that it would be "done by the end of the week" (that was last week). At a certain point, you just have to wait. As long as mine come in this week, I'll be ok--I think another important thing though is to go back to your original communication with them and review the deadline you set. My deadline was "July 20th would be great, but no later really than the beginning of August." (I only submitted my primary two weeks ago..) So, if they've really missed the deadline, that's when you should start sending them more frequent reminders..