I'm using this 'clickhappier-archive' account to post archival copies of old MTurk-related userscripts from userscripts-mirror.org (which is itself an archive of the defunct site userscripts.org) and forum posts, which their authors or others haven't re-posted on Greasyfork yet. Some of these may no longer be all that interesting as more recent scripts may do what they do better, but some remain very useful.
Script Summary: Style tweaks and keyboard shortcuts for MTurkGrind.com
Version: 0.1 [updated by clickhappier to 0.2x for the 2015-01-17 MTG migration from vbulletin to xenforo forum software]
Note from Clickhappier: The keyboard shortcuts are: Left arrow - Previous page; Right arrow - Next page; I - Inbox (opens your PM inbox, called 'Conversations' in xenforo); R - Reply (now just scrolls to the reply area at the bottom of the page); and S - Settings (opens your account page).