Like many I have been clicking to earn bitcoins, and have run into my fair share of share of scammers.
So far the best sites I have found are at
coinbox.me
freebitcoi.in 
http://www.doublebitcoins.com/ref/106/
These have all paid nicely so far.
Some sites I doubt if they'll ever pay up.
Sigh

The paid to click sites and I have never really hit it off. Somehow I doubt I'll ever reach their payout total.
Ok, coinad's cashout total looks reachable, at 0.00005, but seriously one has a cashout of 0.1BTC...
Eh?
That smells,  seriously.