Hi Sam,
The pubCenter beta is encouraging all applicants, but there is a detailed editorial review process.
If you received no response at all, then it may be that the e-mail from pubCenter is somehow being blocked. Please check your junk mail filters and verify that the correct e-mail address is on your application.
If you'd like to let me know here or in e-mail what site you submitted, I can research your status.
Thank you,
Chris
Chris Norred, online community program manager for Microsoft adCenter, API and publisher programs.