Helpful article Becky!
From what I've learned so far about content migration in SharePoint 2010, the most granular level of migration is sites. Or have I got it all wrong?
At my company, we're upgrading from SP 2007 to SP 2010. However, we'd like to change the structure of our deployment. Thus we would not like to backup sites but rather lists - and their content. Really what we would like to do is to migrate the list data from SP 2007 to SP 2010 and are still to find a sufficient approach for this task.
What we have been looking at is to write our own code where we traverse the SP 2007 list data, get the relevant data and similarly add the gathered data to our new SP 2010 deployment.

We may have completely missed or misunderstood some of the new upgrade features of SP 2010. However, as to our current knowledge this seems to be the most sufficient approach. Any thoughts?