I have mine all checked... that way if I miss a post I catch the next time I check email but that is because I am a mod. Mostly if I am mapping I keep both tabs for the forum and the mapping open. If you look at the tab for the forum it will show a little number on the tab indicating that there is a message posted to something you have worked on. Also I get pop ups in the lower right corner telling me a comment has been made. You may not want, or need, that much information. It is really about how involved you want to be with the Tomnod experience.