I got my feet wet with using Piranha CMS for a small site. One point I am not sure how to handle is extending the DB and CMS model for site data.
For example, visitors fill out a form and I capture their info. With EF I have created the class and added the dataset to the context then updated the DB via CodeFirst.
What is the suggested method? Create a 2nd context for the site data?
If you want to use code first you should store your site data in it's own context. Otherwise there will be a conflict when your extended context tries to create the CMS tables as well.
In future releases the Piranha DataContext will most likely be sealed to avoid confusion.