captcha

Now there are multiple captcha types against spam/abuse:

image captcha
ascii captcha
audio captcha
math captcha
easy questions

How will next generation captchas look like? I think in the future there will be much more captchas types like:

car captcha
film captcha
famous people
famous places
number to text
word suggestion with add remove extra letters(ie: gogle, new yoork)
animals (ie: which animals do you see in this picture from left to right)
traffic captcha

What do you think what more could be one of next spam-preventing technologies?

This a small and powerful contact form, which protected with a random colored captcha. You can start to use it with changing just ADMIN_EMAIL. You can easily add-remove contact fields like name, email, homepage, phone number, fax, address, subject, message etc. You can easily set required fields, which visitors must fill.