FLV Player

FLV Player is a small, fast video player that will allow you to view FLV videos without a problem. 
Flash video (that is, FLV files) have quickly become a popular format for online videos. On the downside, not all players are able to open them, but with FLV Player you won't have that problem. It doesn’t support any other format, but in exchange for that it works fast and smoothly.