my best advice is to stop waiting by the mailbox!
I'm seeing all of these posts about people who applied the day it came out and already got an email. I applied that afternoon but I haven't heard anything yet so does that mean I didn't get in??
The best advice I can give you is to relax!
Those who are chosen for NASS are hand-picked by the Regional Director. This man or woman is in charge of a lot as it is, since he or she not only chooses the NASS participants, but also is in charge of candidates for the incoming class. I spoke with my Regional Director a few weeks ago - he's in charge of Region 4, which covers, pretty much, the entire West coast and several states in the Northern Midwest as well. Regional Directors are always working, always traveling, and always in touch with candidates, so just hang tight!
Those who received e-mails the same day they applied were probably on the top of a very large pile that is increasing every day.
If it is any consolation, I had applied a year ago the very day NASS applications were available, at 12:00am EST, to do my best to get selected, and I still did not receive my letter for NASS until April 15.
Don't worry! You'll hear back soon enough. Meanwhile, work on getting in shape so you can enjoy NASS as much as possible. It really is a lot of fun, and the better shape you're in physically, the more fun you'll have!