Facedump
Facedump is a Cocoa application for developers using the Facebook API to inspect the data returned by it. It is effectively a desktop clone of the API Test Console, though it was developed prior to the console's release for my own personal use. One difference from the web-based console is that Facedump returns the actual data your app gets, and the user IDs it provides are exactly those that your application receives.
In addition, it is able to parse XML file lists of users as input for the users.getInfo API call.
More details to come soon.