And note the following:
Some examples of cloaking include:

• Serving a page of HTML text to search engines, while showing a page of images or Flash to users.

I think it is still difficult for SE BOTs to do OSCR scanning and using the bitmap to read / find text on the image.

I use an image to hide my email address for spam bots. In an ideal world there are no problems an no need for exceptions.

I think this W3C And Its Relevance To Advanced Web Design Technology thread is timely.

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