When I was trying to understand database design databaseanswers.org was phenomenal. Now I'm trying to understand the Spring Framework and I'd like to know if there are any sites out there that have domain models already created that I could use as a basis for learning Spring.
I am not sure what do you mean by "Domain models already created". However, here is a shot. Microsoft provides sample databases with both schema and data that you can download and install.
A different download is provided for each version of Microsoft SQL Server, so be careful.