If you are looking for a great internet niche business, start-up a consumer complaints aggregater.
Pick up RSS feeds from the 50 million plus blogs out there. And summarize the lack of love for businesses in a funny, easy-to-read form.
You need a good domain name. Something like: Complaints.com

Actually that one is already taken. I recommended it on Boxing Day 2006.
Taking a sober second look at it today, it’s actually a terrible website. The submission process is email. And the browsing / search interface looks like a porn site from 1997.

I am still waiting for my first free email newsletter.
Almost ANYTHING would be better than this. Leave a comment below if you have another consumer complaints site you like.