dstiles - 8:07 pm on Jun 8, 2010 (gmt 0)
If I detect a bot then I return 404 for a missing page.
If it's not an obvious bot I send the (probably human) customer to the home page where they can look for what they want WITHIN MY SITE! Commercial sense: keep the punter as long as possible.
Interesting that the blog linked to above has three blatant spam responses (still) in it. Do they not know how to trap spam? Oh, no. I remember now, this is google... :)