I missed this session at PDC. There were so many good sessions, it was hard to choose. The good news is that the sessions are now showing up at http://microsoftpdc.com/Videos.
I didn’t get to elaborate on sandbox solutions in any great detail during my recent developer dinner presentation on SharePoint 2010 due to time constraints. However, this is a very important feature of SharePoint that you will want to dig into as you go explore SharePoint 2010. Chances are the environment you will be deploying solutions to will only allow sandboxed solutions.