I clicked on one of my Adsense Referal 2.0 ads by accident. Anyone think there's any harm in this...? I don't think so, but lemme know.
The feature is too new to tell just teasing. Have no clue honestly, take a read on their TOS (they=Google AdSense should have mentioned).
There is no problem with an accidental click, Google normally just discounts this as an accident. A referral gets nothing unless you sign up but if you keep clicking on it, they will ban you because they will think you are trying to scam them. One time no big deal, a few times equals a ban even for referral links.
It depends on how the clicks are. I have accidentally clicked my ads a few times, but they're accidents. If they see you are clicking five times a day, they'll begin to wonder. If they see you are clicking once a month, there are no worries because you're not making any money and that appears like a mistake. But, I wouldn't click on ANY of your own ads.