In a move signalling that Google is well and truly dedicated to improving the user experience of the web, they have announced a new tool that checks if your site is mobile friendly, as well as changes to their search results.
The tool can be found here. Fortunately all of my sites I tested were mobile friendly (including this blog).
Not only that, but Google will also be showing alongside the search results of a page whether or not it is mobile friendly as well. While it is too early to say so, whether this has an effect on the search engine rankings of websites who are and are not mobile friendly remains to be seen.
Now might be a good time to test your own sites and if they are not mobile friendly, fix them up before it starts to mean something and affects your search engine rankings with Google.
Either way, this is a welcome change. If search rankings are affected by lack of mobile friendly site, is that such a bad thing? Traffic on handheld and mobile devices is easily 2:1 that of desktop Internet traffic (expected to double again by 2020).