FLV Player
Macromedia Adobe has a good shot at owning the online video market, with Flash being the one format ubiquitous across Windows, Mac OS X, Linux and most of the handheld device platforms. The could take a big chunk of the desktop video market too, if they'd simply come up with a decent way for people to watch videos locally. I don't want to launch my browser every time I save a Flash file. Luckily other people are picking up the slack and making this possible. FLV player supports local playback of flash video, making it a compelling option for testing files before uploading to a server. It's not quite on par with the SAPlayer included with the full version of Flash, but is an acceptable substitute considering there are no other options at this point. [Windows 9x/2k/XP $0.00]