flatfile - 11:38 am on Jan 13, 2013 (gmt 0)
very tricky and indeed this had always been in my mind as well. When we disable ads (this can infact be extended to any content) for all bots and not just googlebot, will it be considered as cloaking?
I remember one of Matt Cutts' videos. He mentioned something along the lines of: "If somewhere in your code you detect Googlebot, and then serve different content. Then that's cloaking."