If there are any of you out there wondering why you still haven't gotten your invitation codes for .NET Services (even you have already signed up at this link for couple of days), you might want to check the following:

1. Do you have a verified email address at Microsoft Connect?  If you are not sure, you can check your Connect profile.  If you don't have a legitimate email address in your profile, we will not be able to send you your invitation code through email :(
2. Did you ever unsubscribe Microsoft Connect?  The unsubscription might prevent us from contacting you and sending you your invitation code.  If that's the case, you can email mchelp@microsoft.com to rectify your account.
3. Don't know if you should have received a code?  Check this blog post.