Generate architecture diagrams
If you are using OD as your deployment strategy, it knows everything about how your applications are deployed (potentially what databases are being updated), and where they are being deployed to.
If would be super-useful to be able to export the view (at any given point) to generate an architecture diagram of all the systems.
This would help keep any documentation on location of services up-to-date as well as providing a simple overview of where things are.

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Branden DeVries commented
It would also be nice to have a description field in each step to give more details on what the step does and why. We could possibly export to Word or Excel to generate deployment instructions for regulatory compliance.
It would be very beneficial if it would show what Octopus variables are being used in the step too.
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Alex M commented
This would be very useful to get an overview of the entire system landscape across all environments.
As an extension, this could potentially be used to create a live 'map' of all servers & their statuses, either by OD or via the API. This would overlap somewhat with the main dashboard but could include the additional info Richard mentioned (database, server and environment names, what/when/where of deployed packages). Being able to drill into the variables scoped to each machine might cover this, and should be simple enough to obtain from the variable & environment setup.