While we don't focus on unusuals here at TF2S since their values are all over the map, we do appreciate their glory and splendor. Here is a site that allows you to search individually for different effects and shows you who has them. Also searchable are crafted # hats. Who has Team Captain #1? Just look it up! Another cool feature is that they have a hat rating system, that many TF2ers have voted for their favorites. Think the Madame Dixie is the best hat ever? See if your fellow players agree with you.
Link here. You will have to login through Steam to search the database, but don't worry its safe.