easyflv Wordpress Plugin This plugin embeds a flv player in a post or page. All that is required is to upload the flv video and leave the a tag. The plugin looks for a .flv extension within a tags and process the content to add the flv video player.
You can customize the plugin editing the php and adding the proper variables. To set a startimage (a caption before the video plays), upload it when you upload the video, in jpg format, with the same name than the video and it will be added automatically.
The flv player has been made by Eric from http://flv-player.net/, you can see the license terms. He allows commercial use which is why I used his flv player for the plugin. Of course, I give you permission to use it anywhere you want.