Trynt: those folks provide free-to-use REST APIs for a big bunch of stuff. Google or del.icio.us or Flickr related, Whois data, tag suggesting, Captchas, credit card validation, you name it. This looks like a really excellent stuff. Bookmarked.
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Looks like it was too good to be true. It redirects to an amazon sale now.
Ashfame: old post. Try http://theeasyapi.com/ now.
I was just checking out posts tagged as API ;)
Thanks for link to theeasyapi.com :)