On the topic of using internet celebrities in advertising: just saw this banner ad (click it to zoom) on Digg: "In our very subjective opinion, AskCity has become the best mapping product on the internet." The quote is by Michael Arrington, the founder of the TechCrunch blog with over 400K RSS readers that covers tech start-ups. The URL behind the ad was this; it was dead last night when I clicked it, but I'm curious to see what the landing page is.
Arrington wrote about AskCity's launch last December in this post, but the banner quote is not from there and it doesn't come up on Google as published anywhere else.
Online Celebrities in Ad Campaigns
Product Placement in Lonelygirl15
Bruce Willis on iChat