Excellent news app. Definately a real competitor to NetNewsWire. I like being able to sync with my iPod but only headlines and sometimes summaries are synced but I think NewsMac is at the mercy of the websites, they decide how much to provide to RSS feeds if I'm not mistaken.
My only gripe with NewsMac is that if the app crashes (which it has a couple times already in 1/2 hour), then any settings you changed since the last lauch are lost. For instance, if I add a bunch of channels to my favorites or synced list and change some ratings for other channels, then NewsMac unexpectedly quits, I loose everything I just did.