Rich Finn released SPSource on CodePlex a while ago…something very similar to what I had on my mind to do, because of seeing how poorly VSeWSS Solution Generator reverse engineered Lists to ListTemplates (another post to explain this).
You could use other tools to reverse engineer Content Types and Site Columns, but it meant a lot of cut and pasting. SPSource takes all that away and even updates your feature.xml files and creates you element manifest files too! It supports WSPBuilder and STSDev too!
The first release of SPSource actually reverse engineered Content Types, Site Columns and Module files. I have added the functionality to reverse engineer Lists to ListTemplates.
The web cast demonstrates how this is done and the concept of a dev site and a design site when working in this manner. I will be releasing a series of web casts to show how SPSource can be used to leverage development as an individual but also as a team!
Click here to view it in Screencast.com.
Rich Finn has also got some web casts and walkthroughs too from first release:
view file provision walkthrough
view content type walkthrough
view screencast demo