The Open Thread posted at the beginning of the month has gotten really, really big, so I've gone ahead and made another one. Post your new discussions here!
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
They don't mean the same thing at all and the wikipedia entries seem to reflect that.
Check with here, for example, though:
http://www.vetta.org/definitions-of-intelligence/
The "AI researcher" definitions in particular seem to be much the same as the definition of instrumental rationality.