has anyone here really set up Google Adsense for their site and actually earned money? Can you share how much you earn through your site as well as some of your site info (PR, traffice, etc)? I know this is kind of sensitive info, but would really appreciate if someone can answer. thanks.

Technically that's against the TOS. But you can generalize info without being specific and that's not against the TOS.

I have adsense on several sites, some make petty earnings, some do really well. From what I've found you need hits to get the serious cash. One of my sites gets about 100k uniques a day and earns really well. It's only been around for about 6 months so the outlook on it is pretty good. When it first started out it had very low unique views but high page per visit hits. With that the earnings were in the couple of dollar a day range if that. When traffic spiked I saw the page per visit go down but the earnings were higher because of the CPM rate. My CTR is still pretty low and I wish it would increase but for the past month the payout for clicks has been crap. Some others have speculated it's because of it being 4th quarter and ad budgets aren't as high. So right now with the higher traffic it's earning under $100 a day from Google but it's also generating revenue through affiliates and other advertisers.

READ and understand

7. Confidentiality. You agree not to disclose Google Confidential Information without Google's prior written consent. "Google Confidential Information" includes without limitation: (a) all Google software, technology, programming, specifications, materials, guidelines and documentation relating to the Program; (b) click-through rates or other statistics relating to Property performance in the Program provided to You by Google; and (c) any other information designated in writing by Google as "Confidential" or an equivalent designation. However, You may accurately disclose the amount of Google’s gross payments to You pursuant to the Program. Google Confidential Information does not include information that has become publicly known through no breach by You or Google, or information that has been (i) independently developed without access to Google Confidential Information, as evidenced in writing; (ii) rightfully received by You from a third party; or (iii) required to be disclosed by law or by a governmental authority.

https://www.google.com/adsense/localized-terms

Since it is against the TOS, I am just going to give you estimates: I have a lot of sites/blogs that have Adsense ads published. They are small niche sites that earns ranging from a few cents to few dollars. When combined, I earn a little below $50 a day. I am still in the process of creating more niche sites/blogs until I can reach my target which is $100 a day.