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The Obsolete tag can now be used to filter the list of specs in DocBuilder. However, simply adding the obsolete tag to a content spec does not update the last modified date, which in turn means that the DocBuilder will not download the details for the spec. Since adding a tag creates a revision, it also makes sense that the last modified property would be updated too.
Fixed in 1.2-SNAPSHOT build 20130924-1102 This was caused by two things. The first was that it was using the wrong database field for the LastModified value. The second was the ContentSpecToTag and ContentSpecToPropertyTag wasn't setting the last changed field on the ContentSpec table. Note: This version is currently live on the dev server.
Confirmed that adding a tag updates the last modified date, and that a search using the new last modified date returns the expected result.