I've added a modification to the forum that will notify you when a thread you've started or replied to has been posted on (similar to how Facebook notifications work).
For example, If you start a thread and then someone replies - You get a notification in your "Notifications" on the top right hand corner of your screen, similar to when you get a PM.
Another example, If you reply to a thread, and then someone else posts on that same thread, you will receive a notification.
If you want to unsubscribe to a thread, select "Unsubscribe to Thread" as seen here http://screencast.com/t/NOLwJGFZ17gu and you will no longer receive notification for that thread.
If you had a weekly email as your notification type, you will have to set this up again in the General Settings.
Please let me know if you have any feedback or questions regarding this change, I think it's pretty cool