You know those irritating captchas at various sites before you login or sign up? Well, D-Link has caught on with their latest router range which boasts Captcha-capability built-in, hoping to prevent more attacks from malware and spyware. The new firmware also works great with current models, where the familiar distorted letters and numbers combination are added to common router settings pages. The D-Link router models that feature CAPTCHA include the DIR-615, DIR-625, DIR-628, DIR-655, DIR-825, DIR-855, DIR-685 and DGL-4500. You can get the updated firmware here, although older folks who have trouble deciphering captchas might want to give this a miss.