Doesn't hurt. They provide backlinks and potential visitors. It is basically a collection of posts on a like minded subject.
Sometimes newbie also found something interesting which other don't know. This is first time i heard about this. I think i have to look into this. DON.
i am not newbie but i know www.blogcarnival.com two years but i did not use their service because i did not get my own blog so i did not try it.Now i want to build traffic for my blog so wanna try it.what it will make for me?
But don't expect miracles - maybe ten visits a week. They will delete your listing if you don't organize a carnival. I have carnivalofpolitics and carnivalofmakingmoneyonline registered to get submissions from there, I'm certainly not complaining.