Gee, I wonder how to download Flash (.flv) video

Everytime when there's a new video or streaming video file format available online, people will figure out a way to download the video stream. However, I still haven't found a solution to download Flash video from a web page. I only found the following sites so far, and looks like I need to do more investigation later ...

- FLV Player updated
- 讓收費網站去死吧
- 下載Google Video