MaxButtons is a plugin by maxfoundry and arcware allows you to quickly and easily create great-looking CSS3 call-to-action buttons that can be used on any post or page in your site.
Features:
Create unlimited number of call-to-action buttons
Buttons are built on-the-fly as you enter and select options
Works with all modern browsers, degrades gracefully for others
Fully CSS3 compliant with text shadowing, box shadowing, and gradients
Color picker for unlimited color combinations
Copy an existing button to use as starting point for others
See your buttons on different color backgrounds
Pre-defined defaults make getting started super easy
Use the buttons you create on your WordPress landing pages, WordPress squeeze pages, and WordPress sales pages to increase your conversion rates.
Plugin homepage: http://maxfoundry.com/plugins/maxbuttons/
Download: http://wordpress.org/extend/plugins/maxbuttons/