I installed Search Server Express 2010 on a SharePoint Foundation farm. It's a pretty basic install - I let the Local SharePoint sites crawler finish and it found about 200 items. When I look at the All Sites scope, however, the item count is zero. Even if I set the scope update to on-demand it doesn't seem to want to pick up items. Any thoughts on how to troubleshoot scopes?
The problem turned out to be a policy applied in Active Directory that messed with default permissions. A post from the TechNet forums pointed me in the right direction.