I think that what usually happens is that when you send a link to scribd that doesn't exist, it downloads the document and immediately presents it to you in their UI. Therefore, it would seem that the bug is related to scribd, not HN.
The second paragraph [http://ycombinator.com/newsguidelines.html] under "In Submissions" says, "If you submit a link to a video or pdf, please warn us by appending [video] or [pdf] to the title." What is the point of marking it [pdf], if it will be flagged/tagged/whatever with [scribd]?
From a usability perspective, the flag/tag/whatever shouldn't appear in the same style as the title. It looks like the author simply tagged it. Perhaps the scribd link (if this is even needed) should be in the info-line below the title.
I've been using KeePass for several months and love it. The only thing lacking at this point is a suitable version for iPhone. While there is an app, it has a long way to go. I heard that the Blackberry version is great. I use the same database across OS X and Windows machines.
You can also export your Database from the Windows version of KeePass in a form that's easily massaged to upload to your iPhone with the Keeper app. I use this to keep my password database with me at all times, as well as on all of the machines I work on. No subscription or payment necessary!