Unfortunately, archaeological material, but for some short samples on the museum site, is not as well represented. For additional Novgorod materials, see below. There is an introductory page leading to a lot of good photos, with linked pages from headings in English. The problem though is very slow loading time, and the automated system may kick you off into different pages only in Russian. There are interesting items such as a reconstruction model of the Mirozhskii Monastery church and some shots of its frescoes.
Separate pages are devoted to the kremlin and other churches.
Although the text is thin, it is in English and has links to a lot of good quality pictures of the city. You need to click on the image of the flash camera to bring up a linked listing of additional images for individual buildings. Quite a few nice images, including a collection of old photos of churches that were destroyed in the Soviet era. Text in Russian. Daniel Waugh has developed a rather extensive collection of materials on Novgorod , including several extensive sets of images with at least some analytical discussion.