"Do not limit your CV to one page. If your experience spans more than 3 years or more than 3 jobs then you need details and it's madness to limit yourself to one page in this situation."
My interpretation was always that the "one page resume" rule was aimed at new college grads, since they may be more likely to ramble on (and their experience barely matters anyway). The problem is that they don't realize after they get a real job that they shouldn't (necessarily) follow this rule anymore.
I assume you should aim to keep it succinct, though? I've interviewed a guy who literally listed the names of the methods on an API he'd developed. I think he clocked in a 6-7 pages for a three year career. Surprising as he came through a recruiter, I'd assume a recruiter would provide some CV critique.
Chances are the recruiter hadn't a clue what he was looking at. He would have been too afraid to edit it as he had no idea where to start. That sort of info is fine on your personal site which you can link to from your CV but to include it all on your formal CV is madness.
Personally I think 3 pages, 4 max if you are a contractor is more than enough.
My interpretation was always that the "one page resume" rule was aimed at new college grads, since they may be more likely to ramble on (and their experience barely matters anyway). The problem is that they don't realize after they get a real job that they shouldn't (necessarily) follow this rule anymore.