Google's Native Client updates to Pepper API, looks set to fragment the Web
Ultimately, however, NaCl could cause immeasurable damage to the Open Web paradigm. NaCl is an open source project, but it still brings the same risks of fragmentation as Flash, Silverlight and Java applets. As it stands, only Chrome supports the Pepper interface that NaCl requires -- and with IE9 and Firefox 4 only weeks away from release, it would be a long time until support for the plug-in could improve.
If NaCl gains enough traction, Chrome could become the next IE6...
If you want to try out some Native Client examples you'll need to install Chrome 10 or later, which currently includes the Beta, Dev and Canary channels. Enable Native Client in about:flags, then head over to the examples.