FLV Player HD is a simple program that can playback Flash Video files (FLV) on your desktop. The FLV Player is freeware and available for Windows, Mac and Linux.
VideoThang is an easy-to-use video editor for Windows that is free and can turn your digital photos into flash video slideshows with music, transitions and captions.
How to download multiple video files from YouTube, Google Video, Break.com and other web video websites into one single movie or an MP3 file.
Watching FLV videos in the browser is half the fun - you can do so many other things like split FLV videos into multiple clips, trim the introductory music, convert flv videos to MP3 songs, extract image frames from the video, etc.
Video Spin also ships with a variety of 2D transitions, background music and other sound effects to make your amateur movies look slightly more professional and interesting.
Download Adobe Media Player - a standalone FLV player for viewing recorded YouTube video clips, video podcasts and Quicktime movies.