It could be that the college you are wanting to attend hasn't yet submitted the start dates for their summer and fall '08 semesters. Ed Straten told me in an email that that info was delaying the orders requests last week because they were still waiting on a lot of schools to submit that info to them. I'm going to a school that numerous STA-21 selectees from previous years have attended, so the start dates were already well known...
Start dates are different every year.