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Since this is not yet documented, I figured I would mention this here now... we are experimenting with some very rudimentary keystroke navigation in the discussion2 system. We support both FPS style WASD keybindings, as well as the standard vi layout of HJKL. Down/Up will cycle you through next/previous comment chronologically... left/right will cycle you through next/previous in thread order. Holding SHIFT down while you press the navigation key will collapse the previous comment. And when you get to the end, pressing down or right will attempt to retrieve more comments if you want them.

What this means is that you can now use D2 to simulate most of the most popular viewing modes of the original discussion system. By dragging both the abbreviate & display sliders right next to each other you effectively remove abbreviated comments which simulates nested mode. By toggling comment retrieval order to 'Oldest First' and using up down, you can effectivel read the discussion from oldest to newest. And of course the default settings gives you the best comments first, providing a nice default view of discussions for most anonymous users (who rarely participate and we want to really show only the best comments).

You can also disable D2 in the comment prefs (the word 'prefs' in the floating dialog box) if you are logged in. Right now we're testing D2 for a large percentage of anonymous readers. As soon as we finish IE7 support we'll roll out D2 for the rest of the ACs.