Author Chuck Freedman also happens to be creator of today's Mashup of the Day: GameTripping.com, the Ballpark Guide. This full-featured mashup lets you to share and collect your experiences visiting ballparks across the US. Features a guide and gallery powered by Yahoo! Maps and Flickr. Ballpark Collection shows an array of all ballparks, highlighting ones you have reviewed. Even has a GameTripping badge available that lets you show off your reviews on your blog or MySpace and links users back to your Ballpark Collection. You can read more about this on Chuck's blog.