I saw a cool microfiber duster brush on concoursdirect.com. Looks like a cool idea. I use the california car duster currently, and although it works well, I often get red bits of thread stuck on the sap and other debris that's stuck on my paint. I think the microfiber is more resistant to unravelling like that.
Also, even though the Cal car duster's worked wonderfuly so far, I'm still always a little nervous using it, and I think the microfiber would trap the dust better and be less prone to scratching the paint.
At $9 each, it's a pretty good bargain, but I am thinking of cutting up one of my own MF towels, and making a homemade duster. Hehe will do that soon and post pics and thoughts. =)
Josh