Source Media Arcade is an all-in-one media center experience for your PC. Shortcuts to your files, games, and movies appear as full-sized arcade cabinets, hand-held tablets, or mounted view screens. You access your media items simply by walking up to them and pressing the USE key. In version 2, you are able to play in MULTIPLAYER mode where your friends can come join in on the fun.
This is very interesting idea and mod itself. You can create your own arcade in game and its optimized to run as game while running other game. It's like your game dekstop folder but it's 3D, your friends can check out your arcade aswell. Theres also in-game DLC downloader, it's great to get fast various models for arcades and such. It's really great and i like it.