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Have you searched online for info? As it stands, Mac OS X uses Image Capture for scanner and camera support. Most creative apps use the older TWAIN, which isn't bridged from Image Capture (you can use TWAIN scanners on Image Capture apps, though). The default app to scan images on Mac OS X is aptly called Image Capture. It's a fairly simple app: it scans from the scanner and puts it to a file.
Sorry, that was wordy. Just plug it in (if you got it) and open Image Capture. If you're lucky, Software Update will download the needed drivers and you'll be able to scan. If not, look at the manufacture's website for a Mac driver and hope it's not PowerPC.