By the way, a week or so ago I added a new email notification feature that I think is really handy.  If you go to:

My Account >> Edit >> Email Preferences

and check the box and save you can get a notification any time someone replies to a thread you've started.  I'm finding this a great way of keeping track of responses to blog entries I made weeks or months ago that otherwise I'd miss.

That bring up to 3 the types of email notifications you can have here.  The other two are "Notifications," which sends you a digest of all of the days activity by email, and "Subscriptions," which allow you to subscribe to all updates on a given thread or content type.  Having of these options is quite confusing, I recognize.  Every time I think about doing away with one type of notification or the other to make things simpler I talk to someone who says they really like getting that type.  So I'm not certain what to do, long-term, but it is worth experimenting with the different types of notifications to find the one that fits your reading habits best.