Thanks to a recent change to the reports in the MCP, you can now pull a report to see how your reservations were received in your system. The data is captured from the "Received by" field on your reservations pages, which defaults to "Web" for bookings made on the front-end, and can vary as entered when bookings are made in the back-end. 

The General, General 2, and Full Rooming List reports will display this information for you in a new column.