Paid to Click BTC

BTCClicks - Best earner with or without an upgrade. If you upgrade you get paid more per ad, and you get more from your referral's clicks. Referral are available to rent three times daily, but they go very quickly. The referrals cannot be recycled. A great thing about advertising on this site is that your ad is put into an archived list. This is excellent if you need a backlink for your own personal website.

Bitvisits - Surf through websites to earn bitcoin for each page visited. Payments can be sent to your regular bitcoin address, or they can be sent to either your microwallet, paytoshi or faucetbox account. There are two types of sites to view, unique and resurfable. These are good choices to have for advertising as well.
CoinHD - Get paid bitcoin for watching videos. You can also submit your own videos if you need views on youtube. This is an easy way to earn some bitcoin. I also like it because many of the videos are bitcoin related, so it's a good way to keep informed on what's going on in the bitcoin world.