KSAIK  This app. is awesome! I was able to download live performances of my favorite musicians, open them in iMovie and extract the audio and have recordings of my favorite performances!   
(Version 3.2)

NINJA BOY  Thia app doesn't do a thing. It just hangs there... motionless.  
(Version 3.1)

SIMHAMETT  Very great App...It misses just an export module to mp4 or mp3…   
(Version 3.0b1)

OCHYMING  Yes you can download .flv by clicking on the file in the Window/Activity or use Option+Command+A.

But if its a Big file it may takes time, and works better with .swf files.

Also using SafariStand you can press Command+Left mouse Click, and on the Contextual Menu click on the desired .flv file.

But with this software its faster.

Thanks.  
(Version 2.2.5)

NON_PC  You don't need any software other than iSquint. Simply open your browser's Activity window. Look for the largest file and double click on it. It will then download the file. Then drag and drop the file on iSquint and voila.  
(Version 2.2)

OCHYMING  Now its working.

Works well with iSquint.

The best, Free.  
(Version 2.2)

MAC_XCODER  can't get it to work at all.  It opens up but does absolutely nothing when I drag and drop a URL.  It opens another window but it doesn't download anything.  Then it crashes and closes.  
(Version 2.1.2)

MRHOOKS  Plays fine, but the UI is very slapdash. No Dock icon or Menubar menus, not sure why. Its own menu commands don't seem to require the Command key. In other words, it's very non-Mac-like.

I also could not get it to download anything using either Safari or Terminal. I haven't tried the third download option yet.

Also, it's too bad it can't play downloaded .flv files.  
(Version 2.0.3)