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Captchas are a pain... But I've seen alternatives done, such as single letter captcha that rather than being a random letter is a random number.
Actually, theres two random numbers.
And a random operator.
Basically, theres an image that adds/subtracts numbers together and you choose from a list of answers which one is right.
Example (square brackets being an image):
[24] [+] [13]
A: 37
B: 35
C: 13
D: 47
Theres a 1 in 4 chance to guess it though. But thats 1/4 less spam and you just have to click a button rather than type a string. You can also use a text field, but you might as well use a captcha then.
Theres also some that ask simple questions that bots wouldnt guess, like:
What hat is not worn
[Picture of light bulb]
[Picture of lady wearing hat]
[Picture of hat on a stand]
[Picture of a cheeseburgey]
These ones are sometimes pretty funny too, except you have to manually get the images and write the questions.
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