Web based browser for Apple's Uniform Type Identifier (UTI). See http://en.wikipedia.org/wiki/Uniform_Type_Identifier for more.
You can see this running at http://uti.schwa.io/
No. This is just a list of UTI types imported from /System/Library/CoreServices/CoreTypes.bundle/Contents/Info.plist on Mavericks. I'll be scanning applications for all UTI Types and adding them in later builds. I might even add a form to upload your own UTI information.