Robin Good: If you are considering adopting a web design responsive solution to make your web site fully compatible with any type of screen and mobile device, you may want to give a good read to this excellent guide by Slavik Volinskion SEOMoz, which highlights all pros and cons of adopting this approach. Both from a design-usability and from a SEO viewpoint.
SEOMoz: "Responsive design is not a one-size-fits-all solution to mobile.
According to the author of the Responsive Web Design book, Ethan Marcotte:
"But most importantly, responsive web design isn't intended to serve as a replacement for mobile web sites. [...] And as a development strategy, it's meant to be evaluated to see if it meets the needs of the project you're working on."
(via Brian Yanish)