Originally Posted by Zif 
What is image replacement and how can it help with SEO campaigns. I have heard of using image replacement web site logos instead of directly linking in the image, but I could not find out why this method is better.
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Dynamic replacing text with image(cufon (canvas)) and/or flash with a fallback for non-js clients bots, crawlers, parsers or whatever you want to call it.
So this...
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Index</title>
<style type="text/css" media="screen">
@import url(style.css);
</style>
</head>
<body id="index">
<h1>my cool company name</h1>
<p>
my super duper slogan
</p>
<h2>sub heading</h2>
<p>
we are a company....
</p>
</div>
</body>
</html>
...would be more accessible for bots than this
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Index</title>
<style type="text/css" media="screen">
@import url(style.css);
</style>
</head>
<body id="index">
<img src="branding.gif" alt="" />
<img src="slogan.gif" alt="" />
<img src="sub_heading.gif" alt="" />
<p>
we are a company....
</p>
</div>
</body>
</html>
The only point in using image replacement is if it would have to be dynamic (custom fonts etc) else just do it with css. As the point with all of this is to keep the content in the DOM to be parsed.