What about some subsections to clarify the options a bit:

```
Using Astropy as a developer
============================

Here we document three different ways that Astropy is commonly made 
available for import and use during the development process.  This reflects 
different personal preferences and workflows.

Inline mode
--------------
[ Put the text for inline mode here ]

Develop mode
----------------------
[ Develop mode text ]

Virtualenv
-----------------
Another useful technique to avoid having to switch develop mode on and off
without disrupting production use of Astropy is to use virtualenv as explained
:ref:`below<using-virtualenv>`.
 	
Once you have a virtualenv set up and activated, then you can do the same 
``./setup.py develop``, or else do ``./setup.py install`` each time the source changes.
```

+