This seems kind of simple, but has helped me a lot - so I thought I would share it:

When browsing through pages of comments - open the "upvote" links in a new tab or window (i.e., Apple + click, Ctl + click, or whatever). Then hit Apple+W or Alt+F4 to close the new window.

This way, you won't have to scroll through pages of comments to find where you left off.

you could try this: http://userscripts.org/scripts/show/8951

Wow. This greasemonkey script replaces explicit links with xmlhttprequests. Could we do something similar with the reply link as well? That's been a long-standing feature request when submitting reddit comments.

My horizons for what users can contribute to websites have dramatically broadened.

Done. http://userscripts.org/scripts/show/9027

Now can you get submit to inline the newly-added comment without reloading? :)

[edit] Agh, it already does. This totally rocks.

speaking of how to, how can I create a discussion page like this that is on the homepage?

Use the "submit" link near the top of this page. Leave the url field blank to submit a question for discussion.

oh, haha. now i see that text underneath it. i tend to ignore grayed out text. needs to be stronger in the foreground for usability..