Userscripts.org

Go through Sinfest comics using your arrow keys.

Preloads next and previous sinfest strips when browsing the archive for faster reading

Adds a "last read" (when not on a comic page) or "next comic" link (when at the read front) to web comics sites online, that keeps track of where you were, as you catch up with new strips since your last visit.

Adds links the previous and next Sinfest strip by clicking the left/right portion of the present strip, and adds access keys P and N (or . and ,) too for concenience (Alt+* on Windows, Command+* on Mac, Shift+Escape followed by * in Opera).