New Native Client: Stakes and Opportunities on high-performance apps that run your C and C++ code in the browser.

Native Client (NaCl) aims to enable developers to write high-performance apps that run their C and C++ code in the browser. Then via the new Native Client add-in for Microsoft Visual Studio and the new Native Client debugger, things seem very cool.

The Visual Studio add-in aims to make it easy to set up, build, run, and debug your app as a Pepper plug-in and as a Native Client module. For example, if you are porting an existing application to Native Client, building as a Pepper plug-in is a convenient intermediate stage for development enabling you to gradually rewrite the app to use the 
Pepper APIs (video).. 
Regarding the Native Client debugger, called nacl-gdb, this works on Windows, Mac, and Linux, is now available in the SDK. nacl-gdb is based on gdb.