[SalesForce] Report on Contacts with community users

Create a Roll-Up Summary field on Account that gives you the COUNT of Opportunities where Stage = 'Trial'.

Then your report will be on Accounts and Contacts, where Account.Count_of_Trial_Opps__c > 0.

Phil, I have also begun to work on setting up a community in our org recently. I guess you need to buy these licenses in order to be able to see them in your org.

So if you have a Customer Community, the "Customer Community" license is the "Community" version of a High volume Customer Portal license.

From the License types docs: http://na11.salesforce.com/help/doc/en/users_understanding_license_types.htm

The Customer Community license is similar to a High Volume Customer Portal license and is well-suited for business-to-consumer communities with large numbers of external users. The Partner Community license is similar to a Gold Partner license and is well-suited for business-to-business communities, such as a partner community.

In addition to the new licenses, Communities supports all internal and portal licenses including existing Customer Portal, Authenticated Website, and partner portal licenses. Communities doesn’t support the Chatter External license.

So based on this, you can create a user with the following licenses and should be able to access Communities.

Authenticated Website    
Customer Portal Managed Custom
Customer Portal Managed Standard