The "E-mail me when someone replies" checkbox in this forum doesn't really make sense when there's not the option to reply to a comment, does it?
EDIT: What the checkbox relly does is that it sends you an e-mail when somebody comments on the idea. The text should adhere to it.
NOTE: When you're tagged, only the tag notification is sent.
OPEN: What is the behaviour when you untick one/all the checkboxes in your past comments by editing them - does the last edit take prelevance or does just one tick make the difference?