is a question I always ask myself. I have the following page bookmarked to find the answer:
http://www.adobe.com/software/flash/about/
Now that adobe has some weird installer thing, I just want the binaries so I just go to:
Firefox: http://fpdownload.adobe.com/get/flashplayer/current/install_flash_player.exe
Internet Explorer: http://fpdownload.adobe.com/get/flashplayer/current/install_flash_player_ax.exe