If you’re a print designer who regularly receives batches of digital artwork from various sources then this might save you a bit of time.
This AppleScript batch processes folders of images (can also contain nested folders) and creates a report of image dimensions, resolution and colour, including what size each image would be at 300dpi. Here’s some example output:

You can see that it also highlights where images are lower than 300dpi.
Originally written for jaypeg as a useful tool to help ascertain problems (e.g. images in the wrong colour space, or too low resolution) and also help determine which images might be suitable for printing at larger sizes.
[ZIP] Download Sizer droplet for Mac OS X (includes source code)
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This is one of greatest, bestest, acest, brill things ever.
Thank you, thank you, thank you!