I found some really great blogs out there after going through the first batch of entries for ProBlogger's Group Project. You can read my group project here and I encourage you to vote and let other people know about it as well.
Here are a few links I found that might interest you.
Any many many more, visit his blog to have a look at the many articles posted there. I'm sure you'll like quite a few of them. A cash prize seems to bring out the best in people.
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Thank you for including my post! It was a great writing prompt.
I’m also going to post my top 5 Group Writing blogs soon. Although I think it is not going to be easy, considering that there are a lot of great posts that were submitted.
This Group Writing Project is great.
BTW, nice site!