gagaBUX - one of the known PTC site that pays.
CashLagoon is a paid to Click site that is open for people who lives outside US and UK. There is no minimum payout and lots of free stuffs as you earn points. Check out its testimonial page for some details.
A Paid to Review Site. Click here to register and show your talent in creating reviews for any item of your interest.
WordLinx - Paid to Click and Link sharing combined. This is one of the most recommended PTC sites to date. Payout is a bit high but worth the time.
Google Adsense - all bloggers would know about this but only a few were successful with it. The main thing I believe is to build your network and traffic first then addition of these ads from Google would be the next best step.
LinkBucks - Get paid to post links. Checking out this site made me aware of why people leave links on my comment pages. See how it all works in the tutorials in the forums page. Make sure you have a Paypal account before registering here. It is close to Google Adsense, but with some extra limitations. Click here to see an example on how other do it.
Neobux - A "paid-to-click" site. Earn money just by viewing advertisements. This is not a scam and is one of the most trusted PTC sites.
PalmBux.com - A paid-to-Click site that offers small but more realistic figures. They gives payout when you reach a minimum of only $2. They also offer a lot more such as referrals and putting their banner to your blog for clicks also. Click here register but make sure you have your Paypal account first.
Bidvertiser.com - While your blog is gaining traffic, this lures advertisers to add their ad to your blog thus earning you bucks and more bucks when they are clicked. With this site, you can also spend advertising your blog or site to other the same way they would pay you.
Amazon.com - A famous store where you can also sell your stuffs. Whatever your blog's theme is, there maybe a something that corresponds to something that this site sells. They have wide range of widgets and banners that may give your blog a better look aside from the percentage you can get from a purchase when you lead a customer to their site. Clicks to your banner or widget also give earnings.