Jonathan Wilkins took a look at Google new Captchas and found them easy to be solved meaning also to be cracked:
“Users now find the words easier to read – but so do machines.”
According to Wilkins and the tests he did, the new captchas – with no horizontal separator – are 10 time more easy to [...]

Reverse Captcha is a turning test which bots can deal with and but humans will fail! It’s done by using a hidden field. Bots will fill every field attempting not to miss anything while humans do not recognize it.

A new phenomenon of abusing captcha to accumulate personal information and create faked accounts – all for free…

This is a list of 10 resources where one can get free Captcha plugins / scripts.

PWNTCHA , is a decoder project that decodes Captchas by using visual techniques. It proves the inefficiency of Captchas since 92% of weak Captchas can be cracked by bots at 10 seconds only