They'll have no trouble with it at all. I'm yet to encounter a screen reader that reads the name element of an input field. Perhaps it would if the field was otherwise devoid of any descriptive text, but you'd have to be a real jackass to provide an unlabeled input field and expect anybody to know what to do with it. :)

Im afraid you misunderstand me. Again, only the field name is affected, not the label for the field. I've used text-only browsers regularly since 1994 (Mosaic over a 14.4k modem, Lynx, and now Links), and I'm yet to encounter one that displays the name element of an input field to the user.

Third, do they fill out a hidden inputbox? This is sort of the reverse captcha.

This is really a very good test. As others have mentioned in this thread, it's the sort of thing that spammers will circumvent if it becomes widespread, but for now it's great.

There's something else I've found to be really quite effective: deliberately misnaming my form fields. For instance, give the input field that's labelled "First Name" an input name of "phone number." Humans don't use input names to determine what text to enter, but spambots do. Then check that inputâ"if the first name field contains a phone number, you know you've got yourself spammer.

I've used solely the combination of these two things to run one of my websites for two years now, and I get a vanishingly small amount of spam.