When I submitted the article, I left the title exactly like it is at the source. While I do try to follow the HN submission guidelines, I did wonder if the title would be insufficient to readers. My quick thought process concluded when I felt that HN readers would be sufficiently guided by seeing the instapaper.com domain. That's not to say I assumed reader familiarity with the recent 9to5-Arment issues, just that the Instapaper name would tell readers it had something to do with the app/service rather than a topic Marco Arment was writing on his personal blog (marco.org).
I thought that was a reasonable approach. Not perfect, but ample for what I assume is a thoughtful readership here.