Last sunday on the 13th of January,Google again put up a crawl for PR and backlinks.The last time Google updated the PR and backlinks was on the last week of October which was after a gap of six months.But this time the gap was only for three months.And to be more precise am not sure what the crawl was mainly for PR???backlinks??or both??Well the reason it seems Google has changed it method of crawling.Earlier whenever there was a crawl for PR and backlinks only those links would be highlighted that added the PR value to the already existing PR of the website.What I could analys from three of my websites after the latest crawl was that all links present for the website would be cached by the spiders.The pr for one of my website did increase and so did it's PR but the backlinks for the other couple of websites that I work upon increased from 49 to a whopping 265!!! and from 11 to 170....respectively.Various inputs are terming this crawl to be partial.Check this out.

I notice Google is changing algorithm quicker and more frequently these days. Some of my sites are getting more attention lately, I wonder if it has to do with them trying to bump sites up so they too can earn more from adsense money.

Google missed its earning today. while I was reading some of its news and I  realize that they made some internal changes.

"Google executives said a revision in the company's formula for showing advertising links crimped the fourth-quarter results by reducing the number of revenue-generating clicks. Without providing details, the executives said Google made the change to decrease the frequency of "accidental" clicks on ads."

http://biz.yahoo.com/ap/080201/earns_google.html?.v=4

I think this have somethign to do with driving down to sites that have high conversion rates....