Great. I'm saving all of the links in my Evernote but am wondering if I'll be able to find people in the future through my comments/submissions/threads or if I should save them too! Thanks for your help!
Yes, you can find people you've interacted with on HN by browsing Threads (top nav) and Next -> Next -> Nexting through your history. Though the URL of each deep page is not permanent, the threads/history do not disappear and you can always browse your history.
URLs of threads/parent/child comments are permanent.
URLs of threads/parent/child comments are permanent.