Request: A way to mark/remove read articles?

I absolutely love Hacker News, but I find that the more I read it, the more I have to switch to the "new" section because I've clicked most of the links on each page. Then I read those and am forced to return to the mix, diluting my procrastination.

I've googled for a solution but can't find one.

For privacy, it might be best if the page could use javascript somehow and put any read links in a separate section under the unread ones (or better yet, hide them altogether so that every time we click "more", we get 30 unseen links).

If we are logged in, it would be good to have a button to quickly toggle the viewing mode. I realize this is a nontrivial request, so I only propose it in accordance with the talent here.

Thanx!