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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@thomc
On closer inspection, it looks like they based the receiver code on an Arduino project called RCSwitch which appears to listen for and implement 3 different protocols:
http://code.google.com/p/rc-switch/source/browse/trunk/RCSwitch.cpp
These protocols I assume cover a wide variety of those cheap Chinese 433Mhz sensors from eBay, and can "learn" them, but it is not as if it is pulling an unknown protocol out of the air. That would be too difficult with the noise as you say.
With that in mind I guess one would have to implement the protocol for whatever device(s) they are using. So the ability to have the tools/functions available to do that with fast execution is the most useful. So the native code idea sounds like the most flexible.
I am planning on getting my 433 sensors such as temp, humidity, PIR, doorbell, all hooked up to the Espruino, as well as LightwaveRF. So I'll have to figure out how to detect each protocol. This would make a cool 433Mhz sniffer project too ;)