Ship some Solution Templates that show best practices for creating a multi-project solution.
I'd like to see a few Microsoft-approved, in-the-box, solution templates showing how one might set up a proper solution for a real application. There is a ton of confusion about how to do this in the industry, and copping out by saying "well we can't know how every customer will want to do it" is lame. Sure, many customers will do their own thing from Blank Solution, but help the 80% fall into the pit of success by giving them all the pieces in all the right places.
Steve Smith commented
...and I'm sure you can get P&P as well as various Insiders groups to help you come up with and name these basic solution templates.