The iTunes Server that's built in to Netgear software only pushes out music files, not video. I think i'm right in saying that it doesn't communicate with any ATV natively either (happy to be proven wrong).
I've a Duo, and would love to have a full on iTunes server add-on, but think the little guy is too puny to run such a thing (real shame!)
The only way I've found to have videos and music files run on an ATV is either to have a modded ATV1 (so long as you can access the base software), or a low spec Mac Mini (c.2006-2007 will do). Either will set you back between 30-90GBP on eBay (dependent on luck and condition), but they will be able to run an instance of iTunes. I have a Mac Mini (Intel) that services my iTunes needs; with it's low power consumption it's significantly better than having a desktop/laptop running in the background all the time, as well as only costing double the price of the neatest software hack for an ATV1 or ATV2 (note, not ATV3) to read files off a NAS without an iTunes server (and therefore, no need to mess around with JB'ing your ATV1 or ATV2).
