I allow a couple, namely Google Calendar and Remember the Milk (which I use for work, sort of). I don't mind being asked if I'd like to enable them - if I don't

I allow a couple, namely Google Calendar and Remember the Milk (which I use for work, sort of). I don't mind being asked if I'd like to enable them - if I don't want something to notify me I just hit "no". I get that some people would find that annoying though, especially if you're more of a prolific reader than I.