[FabricPaul]

Hi there - it depends on who you're targeting. Our client-side focus is on native developers looking for high-performance in web applications e.g. medical visualization http://vimeo.com/31970502 - the benefits of web applications are great, but performance is the current limiting factor.

We are likely to build support for NaCl in the future.

On the server-side, there is no requirement for a client to install a plug-in - it's for high-performance on the server i.e. semantic analysis, compute bound problems etc

Last point - we also think a lot about hybrid models where performance can be accessed on both client and server. This is much longer term, but the design of Fabric allows for it.

[FabricPaul]

p.s. you can see our sample client-side apps here: http://vimeo.com/groups/fabric/videos and play with them at http://demos.fabric-engine.com

You can how we've extended Fabric to include existing C++ libraries - great for custom data types, streaming data etc

It is not really a consumer web technology - we're acutely aware of the plug-in friction/antipathy. However - if you want HPC in the browser, this is one of the only ways to do it.