Some people have asked me how to send email notifications to different email addresses when posting to different categories. The easiest way is to override the default email notification address set in the prefs. On your weblog post form you should find the following:
Just enter the email address you want to send notification to on a post by post basis, no need to go back to the prefs to change the default. This gives you the greatest flexibility as you can select different email notifications for individual posts.