In the best case scenario, captchas annoy me. In most cases, I can't even read them properly and they make me fill twice some registration form. In some too frequent cases, when I fail a couple of times I get fed up and don't even register with the site they're supposed to protect (And in every single case, I am positive that there are better ways to keep robots away.)
Today, when registering on lifestrea.ms I stumbled upon the very first near-intelligent, almost unobstrusive, practically painless, captcha. What made it so? Beside being not too unreadable, it was simply validated real time via an Ajax server check, preventing an unwanted and frustrating form submission with incorrect field values. Why on Earth is this the first time I see something like this? I can swear I'm not going to fill any more form with a captcha that doesn't comply to this real time validation principle.
Compare this to Quakenet's captcha: ugly beyond acceptable (note the professional looking unstyled link and the so pretty blue frame) and completely undecipherable. This is pathetic.
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