I have tried to collect few bloggers and their earning from the whole world. Have a Look.
1) Blog - TechCrunch
Michael Arrington

Age – 40 years
Earning - $8,00,000 per Month
Topics – Sillicon valley startups
Alexa Rank – 355
Launched – 2005
Visitors - 26 million page views per month
Twitter followers – 1.5 million
Advertising methods -Adsense , Banner Ads,Text advertising
About – TechCrunch was started by Michael Arrington in his backyard as a hobby . The problem with him was that he was obsessed with silicon valley startups. He updated his blog with 20-30 posts every day giving minute details of each and every budding idea in the valley. He attended every seminars and presentations and inserted his head into the veins of budding entrepreneurs. His blog constantly rose up and now have become the best tech blog in the world. His blogging team now comprises of 40 bloggers and he had extended his network of other tech blogs.
Michael is now the 1400 character twitter for sillicon valley giving you the latest updates and crunching his bank balance with the huge money earned from advertising on his blogs.
2. Mashable
Pete cashmore

Earning – $6,00,000 Per Month
Topics – Social media
Alexa Rank – 281
Age – 26 Years
Launched – 2005
Monthly Page Views – 25 million
Twitter Followers – 2 million
Pete Cashmore started Mashable when he was 19 year old. Now Mashable is the most read blog centered around social media. He have converted mashable into a multi author blog and is now one of the hottest geek on the planet.