Notification Question

I’m still pretty new to this whole WordPress thing but I’m loving it so far. My question:

Is there a way (plugin, widget, other?) that my users can receive a notification whenever I add something to the site? I don’t want to notify them when ANYTHING is posted, only when I post something or add a page, etc.

Right now the only way I see to do this is sending separate emails to each user. PITA!!!

Thanks for your help!