I have often wondered this and have spent time and money integrating with Paypal which incidently seems to be increasing in popularity. This blog post of from a while back but it does suggest that thi smay actually be the case. I would love to hearsome comments about this because incerasing conversion is fundemental to success in retail buisnesses like ours. If anyone has any concrete data about converting with Google chckout themplease let me know! Read the article here
Google has just released a starter guide mapping out all of the basics along with new sections covering mobile search.
You can download this free guide from here:
The guide covers all the usual stuff like Meta tage and Alt Tags but is really easy to read and digest. If you just followed this guide and did nothing more your site would improve its ranking in all search engines.