Problem

You want to know which TrackBack resources have been pinged with an entry.

Solution

Click the "View Previously Sent Pings" link on the Edit Entry screen.

Discussion

Movable Type records all outbound TrackBack pings for each entry. To see this list, click "View Previously Sent Pings" on any Edit Entry screen. This will open a pop-up window with a list of resources that have already been pinged.

Depending on the display options you have set for the New/Edit Entry screen, this link may not be visible. It is tied to the "URLs to Ping" option.