Jason Grigsby a tech leader in mobile web development visited Google as part of Web Exponents speaker series which highlights innovations in web technology.
Jason's mobile strategy counterexamples include Chanel (they have an iPhone app but their website is unusable on the iPhone) and the difficulties of finding an Apple Store on the iPhone. His DOs and DON'Ts are:
Check out the video of the talk below:
You can also download the slides.