I use Greasemonkey scripts on both HN and Mefi to help keep track of ongoing conversations. HN: hn_unread by Jens Wille http://userscripts.org:8080/scripts/sho

I use Greasemonkey scripts on both HN and Mefi to help keep track of ongoing conversations. HN: hn_unread by Jens Wille http://userscripts.org:8080/scripts/show/124778 http://userscripts.org:8080/scripts/show/124778 (also a Chrome extension, if you search for hn_unread) Mefi: MetaFilter Scroll Tag by Plutor http://userscripts.org:8080/scripts/show/23270 http://userscripts.org:8080/scripts/show/23270 Greatly improves my user experience on both sites. I suppose this kind of thing isn't built into the sites themselves because of concern about the extra server or client storage needed. Super useful though.