Johann mentioned this on the webinar. It would be quite useful to be able to subscribe to, for example, the "Hot Signals" board, so that each time something is posted, you automatically get an e-mail. This way you are guaranteed to be the first to know, as long as you keep an eye on your inbox.
I'm kept this in 'Feature Requests' for now while I plan it out. Will move it to 'In Development' when Development starts.
Commenting on this again, because it really will be useful. I do come to the site often, but it would be nicer if I could get e-mails for certain categories as and when something is posted.
This could also be done at the same time as the weekly reminders, as the e-mail formats will likely be the same.