I'd love to have a list automatically saved of HN posts I've read so I can come back to them to share easier. I hate not being able to find a memorable post with HNsearch.com or in my history.
I started using evernote's web clipper to just save all articles, blog posts, etc that I read. Clipping the articles easily stays under the free tier and that way I can easily sift through tags and search to find articles I read in the past. I used to think "Oh, it'll be easy to find with a google search later". Turns out that's not really true, and it's much easier to keep your own searchable archive.
I use the Save-To-Read add-on for Firefox. It bookmarks the page I want to a pre-set folder and then I can click a button when I want to start reading (random or chronological order) or I can just cherry pick from the folder.
I have a script that pulls my upvotes from HN and posts them on my bookmarks site tagged "hackernews": <a href="http://aaron.pk/bookmarks/" rel="nofollow">http://aaron.pk/bookmarks/</a>
I use a bookmarking service (Pinboard) as I do for all pages I consider that I might need to get back to at some point. I also have the Pinboard archival service that saves a copy of the web page in case that goes away.
With the browser plugin of <a href="http://favtool.com" rel="nofollow">http://favtool.com</a> and I add tags 'HN' and 'read later' and eventually more descriptive tags.
You might wish to try <a href="http://hmpgr.com/apps/pins" rel="nofollow">http://hmpgr.com/apps/pins</a><p>We are in beta. Invite Code: HN<p>disclaimer: I am the developer behind it.
I am using Pocket (<a href="http://getpocket.com" rel="nofollow">http://getpocket.com</a>) to do this. And i do this to make my personal reading list.