I know a guy who works in one of the biggest local online store with thousands sales per day. Their conversion rate changed by +5-7% after adding some cool glossy effect to their “buy now” button. That just won them few thousands dollars per day right away. Now i am trying to convince him to make it 20% bigger to see sales skyrocketing xD
Google “Baymard Institute” and “buttons”. They are usability guys.
Epic Bagel is a company selling a product but they are also usability guys. Look at their buttons.
If you can read Dutch I recommend reading Aartjan van Erkel. He also wrote a book (in Dutch) called Verleiden Op Internet (Seducing on the Internet) which discusses many things including calls to action.
Design-wise, I remember Zurb making some neat CSS3 buttons, but now everyone’s got those.
Call To action buttons are most important part of a design because it is easy to understand and very effective. There are various types of call to action button for a variety of functions that’s means each action button plays a different role to provide or upload information such as downloading and place requests. Call to action buttons help to create a user friendly web design which will assist to obtain more users to the site. You can see call to action buttons in major E-commerce website such as SignUp, Trial, Download etc.