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Another technique that we have found useful is to make the form a two-page form. On the first page, we ask for the submitter's email address and then, on the second page, we ask for the rest of the information. This, of course, adds a barrier to human submitters as well that may not be acceptable in certain cases. However, we tend to use this technique in situations where we can add value for the submitter by using the email address to look up information to pre-populate certain fields (such as demographic information) on the second page of the form so the submitter doesn't have to type it in. On single page forms, we've used the hidden text field technique described by others. For the first six months or so that we used the hidden field technique, I scanned all the submissions marked as spam by that technique and never saw a false positive. --Jim