This is an excellent article giving examples and best practices of "call to actions" buttons. It's important to periodically review and compare your organization's website pages to current industry trends.
The reason for this that professional top quality web design and development is never about making things pretty; it is all about maximizing opportunities to convert every day visitors into long term and devoted customers, members, supporters, and fans. That's a learning process the industry has been on since the creation of the first browser. Make sure you site is kept up or it will be your organization that is left behind.
