Just in case you weren't already getting tired of captchas there is a new click-jacking technique which works on both IE9 and 10 in Windows 7 and also on Chrome for Windows 8 so for the time being you might want to avoid any captchas that begin with an 'R'.  The new Smartscreen features on Win8 as well as UAC should give you at least some defense and require you to allow the exectuable to run and infect your machine but you can be guaranteed that some less observant users will click straight through without reading the messages which appear.  While this type of attack is nothing new, the particular technique mentioned at The Register does have some new tricks.

"A security researcher has discovered a sneaky social engineering trick that might be used to disguise the go-ahead to run hostile code on Windows 8 machines.

The so-called keyjacking technique, uncovered by Italian security researcher Rosario Valotta, is similar to clickjacking. However, instead of fooling marks into generating fake Facebook likes, the keyjacking involves disguising a "run executable" dialogue box within a CAPTCHA challenge."

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