I have searched on this topic and found this thread. Given the date I was curious if this feature has been implemented. The reason I ask is that I attempted this with no luck. That said, is there a way that when choosing "View New Posts" (and if we've subscribed to specific forums) that we'd only see those threads/posts from those forums? I know that this can be done in vBulletin because the forum I moderate is uses it and we've created this kind of a feature.
Anyways, just a thought.
Forum subscriptions work, in the sense that you can receive daily or weekly emails for updated and new threads. To do so, click on [Subscribe] from the home page, or once in the forum, forum tools -> subscribe.
If you want to PM me the URL of the forum you mod at, I'll look at there subscription system, it sounds like a hack, as i am sure that is not a default option.