How about a subscription to a topic area. Let's say your company is going to publish 2 books / yr. on Java. And the street price for each is $40.00. You could offer a Java topic area subscription for $60/yr. This would give me access to benefits like a discussion board where the author(s) will participate and access to pre-release versions of the books. In particular I think access to pre-release copies of the books is interesting. That way I don't have to wait several months past GA for an update of my book on, for example, J2EE 1.4. Subscribers would also, of course, receive dead tree copies of the published editions.
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How about a subscription to a topic area. Let's say your company is going to publish 2 books / yr. on Java. And the street price for each is $40.00. You could offer a Java topic area subscription for $60/yr. This would give me access to benefits like a discussion board where the author(s) will participate and access to pre-release versions of the books. In particular I think access to pre-release copies of the books is interesting. That way I don't have to wait several months past GA for an update of my book on, for example, J2EE 1.4. Subscribers would also, of course, receive dead tree copies of the published editions.