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"4) Get custom error pages.
One of the sites in question returned an error page for awhile: "We're having server trouble, please stay tuned." However, other sites hosted by the same hosting company were also returning that same page (it looked like a template error page provided by the hosting company).
Since we saw that same content on more than one URL, we ended up only indexing one version of it, and (to the dismay of the webmaster who reported it here) it wasn't his version. "
[edited by: engine at 2:52 pm (utc) on Nov. 28, 2007]
[edit reason] formatting [/edit]
The thing to be aware of is custom error solutions that return a 302 redirect code to get to the custom content. That can be trouble.
I have a client with a programming problem, which makes 1 page response to be 404 but to actually return the proper content (the page exists). This page is not only indexed, it also has pagerank.