I always feel like I take more from this forum than I give, so I will try to give what little I have.
I went to a SEO meeting last night, and one of the speakers, Paul Bruemmer, of Web-Ignite said he was talking to one of his buddies at Alta Vista last week. Apparently, Alta Vista gets 200,000 submissions per day and of those, 95% are spam. He then said, and I quote
"Techniques of stealth will be 'shaken out' soon" (He said this twice, word for word, once in his talk, and once after I asked him about it again.
I tried to get him to elaborate, to see if cloaking was what they meant, but I could not get a clear answer. Since this guy talked about doorway pages being something he did not like to do, it implied that "doorway pages" and "techniques of stealth" might be considered the same.
This is probably something you already know, but I thought I would pass it along anyway.