In response to a question I left him about the AdSense crawler (see yesterday's posting), Matt Cutts left me the following response:
Eric, I talked about mediabot more today and even made a couple PowerPoint slides. I may post about this more when I get back from WMW, but: pages with AdSense will not be indexed more frequently. It’s literally just a crawl cache, so if e.g. our news crawl fetched a page and then Googlebot wanted the same page, we’d retrieve the page from the crawl cache. But there’s no boost at all in rankings if you’re in AdSense or Google News. You don’t get any more pages crawled either.
In other words, it's just the “AdSense pull” model being used, which is what I thought. This lets them make better use of their bandwidth. Now there's still an open question as to whether or not all the different crawlers Google uses are all storing the same information, as some have reported different results showing up in the Google index depending on which crawler fetched the page. Time for a new question to Matt, I guess!
Eric Giguere is the contextual advertising expert who wrote Make Easy Money with Google and Uncommon AdSense. You can read this blog by mail if it's more convenient for you, just send a blank email to memwg-blog@aweber.com to subscribe.