Very well designed native user interface that mimics the web in a very iOS friendly manner.
When you reach the end of the list, just keep scrolling to load the next set of items.
View all the pages on Hacker News including New, Ask, Active and even Best submissions and comments.
Share your favorite posts on Twitter, Facebook or via Email.
Add links to Instapaper. You can even customize the title of your link before adding it to Instapaper.
Search HackerNews for stories, comments and users.You can sort your search results by relevance,points or date.You can even save important searches.
View a history of all the posts and comments you have viewed. The history data is private and is stored on your device. It is even synced between your iPhone,iPad and iPod Touch.