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Hi Logie - and welcome.
Along with several other cameras, I really enjoy using my D40 for lunar work. It beats my Canon 350D hands down for this object - giving beter tonal graduation and colour for some reason. It also works very well for some bright-object deep space, such as M42 and a few of the clusters. The Canon is better for dimmer stuff. The D40 is quite noise-free in comparison, and amp glow is absolutely minimal. One great thing about the D40 is its inherent lightness.
In relation to the A100, it's closer to a D80 than D40, so I wouldn't be able to offer advice. Given the A100's lineage, I'd imagine that you'd also have to perform a "mode 3" exercise to stop the camera from pre-processing RAW images and removing stars as well. Not a biggie.
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