Reading Usable Help
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Gordon R. Meyer
Linking: All things in moderation
Gerry McGovern, writing No Link Is an Island: The Problem With Silos on the Web for CIDM, makes the argument that "silos of information" result in confusing navigation and hard-to-find documentation.
McGovern's advice makes sense, but the nature of silos is that you don't have control over your neighbors. So unless you're able to coordinate exceptionally well, sometimes pretending that other sites don't exist is the only way to bring structure and order to your own. It's one of the biggest challenges for technical documentation on the web, I'm sure we'd agree.
See also: To Link or Not to Link