There are some really useful and interesting comments regarding colour (rgb & cmyk) for those of us involved in design for print. They are at Creative Bits and are in response to this question regarding rgb & cmyk conversion.
There is also a review of Skitch, which looks like its going to be a pretty useful & cool app, especially for anyone working with images. I've received an invitation and downloaded it, but have only had a very cursory go with it so far. More anon.