Besides massive videogames like RPG or FPS, I also like the kind of small games that enable you to have a fun time during your coffee break or similar. Simple pastimes like Tetris, PacMan, Sudoku or Breakout are always welcome when all you need is some casual entertainment.
Wininizio Games includes all of these plus many other classic videogames, all carefully organized into categories and ready to be taken with you anywhere in your USB portable memory device. I must admit the quality of featured games varies a lot and there are some of them that can't almost be played, but in general they offer a quick, easy way to have fun before going back to work or while commuting with your laptop.
The Wininizio game suite includes several game genres (puzzles, strategy, board games, card games, etc.) but some of the categories include only one game. Also, the installation is in Italian but it's quite intuitive (you know, "Avanti" until you're "Fine").