It'll be interesting to see how well this works. This is something that has been talked about in various anti-spam groups for a while, but as far as I know nobody has productized it until now. I'm going to assume that Barracuda has done some internal testing on this already and has determined that the processing demands aren't terribly excessive--and since Barracuda relies largely on SpamAssassin and other open-source technologies, the cost burden is probably next to nil, too--so we ought to start seeing this appearing elsewhere in short order.
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Barracuda Attacks Image-Based Spam
Yesterday Barracuda Networks announced an upgrade to its Spam Firewall product that provides the ability to apply optical character recognition, or OCR, techniques to incoming e-mail. This is an important escalation in the spam/anti-spam arms race, and something that will hopefully become more common.