Siān Echard's Medieval and Arthurian Pages has some illustrated discussion of the Winchester MS and Caxton's print.
Sample hi-resolution images of the Winchester Manuscript, British Library. These images provide us with but a glimpse of the important work being done by the HUMI Project.
Norton Topics Online has an enlargeable pseudo-colour image of the Winchester Manuscript, fol. 349r (the beginning of The Noble Tale of the Sankgreal).