I have an Epson V700 Photo Scanner, designed for making relatively high resolution scans of film transparencies (technical specs claim 6400dpi, but scanning options include up to 12800dpi). Usefully, it allows scanning of reflective media at the same high resolution, which means I can capture images (of objects flat enough to go on the A4 glass bed) at almost microscopic levels of detail. It can also capture colour in these images at 48 bit depth (16 bits per RGB channel instead of the usual 8 bits), which allows lossless colour optimisation before converting to a 24 bit image for final output.

I've just moved house, and there are a range of strange plants in the garden. I've scanned some tissue samples from them in the hope of capturing scientific resolution images (below). Not quite able to see stomata on the leaves, but on the flower petals you can make out individual cells if you view the images at their original size (click through images below, or here for example). Nevertheless, the magnification is impressive, there are many features visible which you cannot make out with the naked eye, or even after macro photography. Also, I like the colours!