Here at webBackplane we work on standards, software, tools, training and consultancy that relate to web applications. We're particularly focused on those applications that need dynamic user interfaces, or relate to the semantic web.
Our team has a lot of experience, not only in building these kinds of applications, but also in building JavaScript libraries and browser extensions that help to take these applications out of the everyday. We also work hard within the W3C, assisting in the evolution of the standards that make dynamic web applications possible (in some cases we even invented the ideas), and we've published, blogged about, and spoken on many of the technologies we use and the services we offer.