alt Hacker NewsI used Oberon [1] in school, and it had a bunch of funky UI ideas. One I liked it if you clicked on the scrollbar then it would scroll that position to the top. Like if you click the exact middle of the scrollbar then it would scroll up exactly half a page. Right click went the opposite direction, and middle click went to an absolute position. When reading that means you can choose a paragraph as the break point, click next to it, and that paragraph is now at the top of the page. It's nice too when you reach a heading that might be only a little way down the page, but you can reliably scroll so it's at the top of the page and feel like you are really "starting" a new section.
It could work well with e-ink because it's basically not interactive; you don't press and hold and move around to adjust it just right, instead you can confidently get an exact scroll position with one tap.
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You could have a scroll-down bar on one side and a scroll-up bar on the other side that work that way (given the lack of left/right click options). That could be pretty intuitive for touch.
NeXT also had "click to scroll to here" and Mac OS X added it as an option (which I always enable).