Our scanner is an Epson Perfection 1260. It's a 1200dpi flatbed scanner, and it lives to the right of the PC just outside Brian's office door J341. The manufacturer's page with driver downloads, manuals, etc. for it is here.
Being that the scanner itself is portable, people often take it to their desks, though it's home is right next to the Color Laser Printer. If it is not in said location, ask around (read: ask Chen-Yu)