Eventually we'll all be at the mercy of robotic overlords. For now, though, the kind that steal your email address and personal info aren't great readers. HideText throws them off by turning words into images.
Why go to such effort to make your text suitable for human eyes only? The principle reason is to keep information away from thousands of spam bots, web crawlers, and other automatons who devour and capitalize (read: annoy you with) data from the internet. Whether you want to include your email address on your blog without it getting sucked into the speed dial of an "exiled Nigerian prince," or you'd like to include text in a forum post that can't be indexed by Google, HideText can do it.
The webapp has an email address generator, seen in the screen shot here, and a basic text-to-image converter. You won't be trotting HideText out for every occasion, but when you need a quick and dirty bot-unfriendly way of sharing addresses or text, it's a free and simple solution.