Google needs to keep its loyal advertisers and coach them the best techniques and tweaking strategies to enhance their site and its ROI and CPA. Google created Google Website Optimizer ( optimiser ) what we all as search engine marketer knows as usability factors that increase your selling process in less time. You need the visitors to buy or get the highest trust towards the ads that he clicked on and take less time to buy the product.

Why does Google worries about all of this, it is just because they need to keep their advertisers happy enough and use later on their Google Checkout ( the more Google can teach you, the more money google can get in return), what I call Knowledge process outsourcing or sharing.
Two things to keep in mind:

1. less time for your visitor to make a decision ( trust, usability factors, easy personlized features)
2. higher CPA ( CTR, time, check out )

Beirut shopping list, from Lebanese comic artist Mazen Kerbaj

“TO BUY (quickly): water / coffee / batteries / chocolate / ink / candles (a big stock) / canned food / bread / picon cheese / toilet paper / radio powered by batteries / matches / black felt pens / rolling paper / milk (still consumable.” From comic artist/musician/blogger Mazen Kerbaj, who has decided not to evacuate, and is holed up in Beirut with family and loved ones. Link to this one, and there are many more incredible drawings in his flickr stream — like Evacuation Blues, and this one. Previous BB post on his work here. More to listen to Lebanese Music .