Out of the box FlatPress provides captcha protection to comments via Accessible Antispam.
In an effort to give something back to the community and hopefully help with the digitization of books I have developed reCaptcha for FlatPress.
To use the plugin follow these steps.
Version 1.1 of the plugin now makes the four standard reCAPTCHA themes and eight languages (English, Dutch, French, German, Portuguese, Russian, Spanish and Turkish) available.
Support for Italian has been added to the plugin using this mechanism (with thanks to Roberto Rossi).
Additional languages, or overrides of the text displayed by reCAPTCHA are also supported - as described on the page announcing version 1.1 of the plugin.