So I have this running battle with my flash. Specifically, I cringe every time I use it (particularly indoors). I'm just never happy with indoor flash shots. Anyway, as a result, I am reckless with my ISO often cranking it up 800 and even 1600 to avoid using the flash. The problem is at 1600 ISO, the Rebel can get pretty noisy.
As a result, I've been thinking about buying Noise Ninja to give me a hand cleaning up some of these photos but with the release of Aperture 2.1 it now appears the Noise Ninja developers are going to release an Aperture version as early as May. Needless to say I'm going to wait and see how this all shakes out. Noise removal seems to make more sense to me in Aperture than Photoshop so I'm crossing my fingers.