Technical Q&A with Lennard Zinn: How to stop cyclocross brake chatter - VeloNews
The gist is, the closer your cable stop is to the brake arms, the less likely the brake is to chatter. His first picture is a tad misleading: it looks like an old MTB stem with a built in cable stop on his cx bike.
Niche product of the year: aftermarket bolt-on brake bridges (with cable stops) for carbon cx forks?