I was just surfing around :) and as I know of a few 'cloaking ids' in some various cloaked pages, I thought I would do a test.
No, I'm not going to give away the ID of the pages, just the numbers for results:
Alltheweb 7,475 pages with 'uniqe id' all cloaked
Ink 1 page, however, the page was a 'keyword ranking report' for a media company, showing google search results pages :) very amusing, I must say.
Northernlight (though they are ending this) 15,157
Directhit - doesn't produce a 'total matches found figure' but there are a few pages worth :)
Altavista 33 results found
Wisenut 25 documents found
Teoma - 0 results found (though as we know, they haven't spidered with a teoma spider since Sept.)
Very, very interesting info...now I am wondering, why would anybody do this with their pages? Is there some advantage to this I can't come up with?