I highly recommend Cameron Marlow's post about how to be more social with flickr. I had no idea random people were commenting on my photos, but now I can get a feed of comments in bloglines! Follow his instructions, they're really easy, and you too can keep track of your friends photos and comments.
Note: the userid is *not* your flickr login. Make sure to use the site he links to to get your id, it should look like this: 12345678608@A10 (fake userid).
Also, if you're a livejournal user, you can easily add RSS feeds to your friends page!