According to this post, Google is going to make things a little easier for mobile users:
Have you ever tapped on a Google Search result on your mobile phone, only to find yourself looking at a page where the text was too small, the links were tiny, and you had to scroll sideways to see all the content? This usually happens when the website has not been optimized to be viewed on a mobile phone. This can be a frustrating experience for our mobile searchers. Starting today, to make it easier for people to find the information that they’re looking for, we’re adding a “mobile-friendly” label to our mobile search results.
This change will be rolling out globally over the next few weeks. A page is eligible for the “mobile-friendly” label if it meets the following criteria as detected by Googlebot: Avoids software that is not common on mobile devices, like Flash; Uses text that is readable without zooming; Sizes content to the screen so users don't have to scroll horizontally or zoom; Places links far enough apart so that the correct one can be easily tapped.
With more people using their mobile phones to surf the internet accessibility is apparently becoming an issue, and if you use your site or blog to promote your books you may want to see how yours will be flagged. According to Gerard over at The Presurfer, where I originally found the info and the link to the test: "This change will affect mobile searches in all languages worldwide and will have a significant impact in Google Search results. Users will find it easier to get relevant, high quality search results optimized for their devices."
To find out if your site will be flagged as mobile-friendly, go here to test the URL. And in case you're wondering about PBW: