a {
  -moz-transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -o-transform: scale(1.1);
}

http://sixrevisions.com/css/10-random-css-tricks-you-might-want-to-know-about/

For progressive enhancement, you could use the transform property that is supported by many browsers that have CSS3 support.

Here’s a trick for enlarging a elements on hover by 110%.

Use CSS transform for Interesting Hover Effects

css, CSS3

CSS