I fail to see any comparison here.
WebRTC is a project building support for things like P2P and Device API support into modern browsers. This is so you could do things such as access a user's video camera through the Device API and establish a P2P stream with another browser, without using any Flash or installable plugins.
Now is just a JavaScript library that enables you to do RPC with browsers.
Re:WebRTC
by drivebyacct2 on Sunday July 10, 2011 @11:07PM
(#2749308)
Besides no built in video and audio support?
[1] YC W2011