Excerpt: Although externally identical to the Stylus Photo R1900, the Stylus Photo R2880 isn't quite the same inside. Epson has tweaked the print engine to make it even better-suited to photo printing. The difference lies in its inks. The R2880 uses eight different colours: photo black, light black, light light black, cyan, light cyan, vivid magenta, vivid light magenta and yellow.
Summary: I think the main question that the Epson Stylus photo R2880 has hanging over its head is whether the new features warrant the extra £200 or so more than the R1900. If you're a monochrome photographer and printer, then you'll love the quality that this printer will give you.