It'll be interesting to see how this works. As a user I'm a fan of thick clients, but it's an unanswered question whether and when thick clients are a valuable companion product for a web app. This is another data point to that question. (I guess Twitter is another example of a place where thick clients have a clear place alongside the standard web thin client, but that's somewhat different in that these thick client…
Browsers should probably eventually have some way of detecting and using specialty hardware on the host. It's a pretty apparent limitation right now.