Sleazy Fork is available in English.
Can work on almost any webcomic/manga page, preloads 5 or more pages ahead (or behind), navigates via ajax for instant-page-change, lets you use the keyboard, remembers your progress, and it's relatively easy to add new sites
exhentai request new image
Sometimes Webcomic Reader can't load the next page on exhentai because the image is broken.
Would be cool if we can press the "Click here if the image fails loading"-Button from the next page.