There are a lot of programs out there that are capable of tagging MPEG-4 video files (.mp4, .m4v), most of which are free or open-sourced and usually based on Atomic Parsley, mpeg4ip, or mp4box. The benefits of tagging are numerous and include the ability for all associated metadata (title, season, description, ratings, actors, artwork, etc) to be embedded within the file itself in order for that asset to be properly searched on and display the titles information. Over the past several months, I have tried numerous graphical MP4 taggers including YAMB, iPodTVShow, vID Infiltr8, and the Yahoo Widget, iTags. I was less than impressed with most of these, although for a Mac only application, Infiltr8 seemed the most complete. My goals were simple. A cross platform application that was fast, easy to use, well organized, supported iTunes Music Store tags as well as artwork, podcasts, TV shows, movies and ratings. It had to properly read and write the tags and cost little to nothing. A lot to ask for? Perhaps. But there is a solution and it's called Tagger. Personally I think the name is aweful as a Google search for tagger reveals over 3 million records, none of which are relevant. Tagger is a Java based MP4 audio/video tagging application that supports both OS X and Windows and uses the open source Atomic Parsley library. There are Mac/Win versions for both Java 5 and Java 6. Being Java based solved my cross platform needs and as far as the others are concerned, Andrew, the author of Tagger has done an excellent job creating an easy to use, fast and feature-rich tagging application. The current version is 3.2b with version 4.0 being designed at the moment. If you're looking for the fast, free and flexible MP4 video tagger, check this one out.