I hope this is a valid question to ask here... but knows anyone a better spam protection than reCAPTCHA? We've now using reCAPTCHA for some time but got now the situation that obviously more and more spam comes through. Is there any better but still more or less user friendly spam protection you can recommend? It can be just a concept or also a (free) service.
A friend of mine who told me about the method reported so far a 100% success rate in protecting his sign-up forms using this little neat trick.
I'd like to suggest you have a look at a new technology my company created. It's called "VouchSafe" and is available free at http://www.vouchsafe.com
We've created plugins for Wordpress, Joomla, Drupal, and PHPBB, or you can roll your own integration with our APIs for PHP and C#.NET.
Depending on your environment you could use Akismet too. It was created to fight blog comment spam.
I'm suggesting you cloudflare services, see http://www.cloudflare.com/features-security
I have the CloudFlare Free plan and it suit my needs perfectly, Fast DNS (geo), Caching and Threats blocking.
Another alternative - http://mollom.com/
Quoted from their site:
Mollom actively protects 51,278 sites from spam currently. Mollom is very accurate, only 5 in 10,000 spam posts were not caught.