I found an interesting use of HTML and Javascript while browsing this site on the Russian Futurist designer El Lissitzky (1890-1941), “Monuments of the Future”: Designs by El Lissitzky (Getty Research Institute). For the catalogue of the Soviet Pavilion’s installation at the International Press Exhibition in Cologne in 1928, Lissitzky designed an accordion foldout of photomontages. The Getty Research Institute page for this foldout lets you scroll right across the panels of the foldout.
I’m not sure about the rest of the design for the site with its use of frames, but the information and images make this a first rate research site.
An interesting feature of the site is that you can compare HTML (“Common Format”) and Flash (“Enhanced”) versions. To my mind the HTML is better; I’m not sure what is enhanced about the Flash version.