Software is changing the world; QCon aims to empower software development by facilitating the spread of knowledge and innovation in the enterprise software development community; to achieve this, QCon is organized as a practitioner-driven conference designed for people influencing innovation in their teams: team leads, architects, project managers, engineering directors.
The reason it's popular is because it is the only cross-platform option.
Even HTML 5 can be done in F# using the HTML5 'combinators'. For example, the following is F# code:
Div [Width "200px"] -<
[ H1 [Text "HELLO, WORLD!"]
P [Text "123..."]
That looks very close to HTML (sorry I can't post the corresponding HTML here as its not allowed).
Check out this video of a Web IDE built with F# and WebSharper:
I believe F#/WebSharper makes the most sense for contemporary business web applications.