Most people don't need anything more than a Web browser and a Macromedia plug-in to watch Flash videos. However, if you want a hair's breadth more control over your viewing, this open-source freeware program will do the trick.
FLV Player's exceedingly simple controls allow you to navigate backward and forward through videos and play them in a loop. You can also adjust the volume, mute it, and adjust the size of the player. The Settings menu provides some basic control over program behavior, such as opening a new player window when double-clicking on an FLV file and remembering previous settings. And that's about it.