Whenever I browse Hacker News, I find myself opening the discussion in a new tab, then clicking through in that tab to view the article, then popping back to the discussion. It's all very annoying, when what I really want to do is get a quick overview of the article and see if there is any interesting discussion going on before I dive into either the article or the discussion.
YAVCHN lets me quickly browse an article in scaled-down reader mode in one pane and see the discussion in the pane below. If I find either one compelling, I can click "Open original" to see the original article or "Open on HN" to join the discussion on Hacker News.
- Left pane: The list of articles on Hacker News - Right-top: The linked article, reader-mode extracted - Right-bottom: The HN discussion thread
It also browses Lobste.rs in a similar fashion, if you ever peek over there.