I had also submitted my stuff on the 12th and had not gotten a follow up e-mail. My friend at work applied the 14th and got an e-mail on the 17th. Looking at his stuff Vs. mine I noticed something. In order to make the "plain text" resume look correct I had used the underscore ( _ ) key in place of some spaces. It made the resume look good to the human eye, but what if it was not a human looking at it? What if it was just a computer program looking for key words and numbers? Would the underscores confuse the program?

The night of the 18th I went back in and reformatted my plain text resume to remove all the underscores. Lunchtime the next day I had the follow up e-mail.

Not sure if that could be your problem or not, but I would feel bad if someone missed an opportunity for something as simple as formatting.