I’m not sure how new this Flickr feature is, but it still has the “new” graphic next to it so I’m certain I’m sailing through unchartered waters for at least some of my visitors.
Looks like Flickr can now email you when you get a new comment on a post, or when one of your contacts uploads a new photo! It’s also possible to do the former by subscribing to the feed on your recent activity page. That’s what I do, and I also use that feed in my Flickr comment importer to bring Flickr comments to this blog.
So, pick your medium, RSS or email. Which do you prefer for notifications?