But I haven’t seen anything specifically stating that I need to jailbreak my ATV to use aTV Flash. Do I?
yes just go back to the page and reads were it states minimum requirements and with you being on a jailbreak site should have been enough for you to put 2 and 2 together.
Found on: http://firecore.com/atvflash-black
Jailbroken 2nd gen Apple TV Mac: OS X 10.4 (Tiger) or later PC: Windows XP or later Internet Connection
Ahhh, thanks…Neglected to scroll down.