Not quite a featureset like Wayback Machine...in that going to a certain day will show you top stories ranked by cumulative votes since submission...rather than the algorithmic position, and number of votes received from that day...but that's presumably not available via the API.

But even as just a list-by-day, it's a lot of fun to browse, especially going back many years [1]. What did you use to build it?

[1] HN's first day, http://www.waybackhn.com/?date=2006-10-9

1. Y Combinator (ycombinator.com) 61 points by pg 3175 days ago | 18 comments

2. A Student's Guide to Startups (paulgraham.com) 16 points by phyllis 3175 days ago | 1 comment

3. Feld: Question Regarding NDAs (feld.com) 11 points by pg 3175 days ago | 1 comment

4. LikeBetter featured by BBC (bbc.co.uk) 10 points by frobnicate 3175 days ago | 0 comments

5. MySpace: Not a purely viral start (startup-review.com) 9 points by starklysnarky 3175 days ago | 1 comment

6. Salaries at VC-backed companies (blogs.com) 8 points by pg 3175 days ago | 3 comments

7. Google, YouTube acquisition announcement could come tonight (techcrunch.com) 7 points by perler 3175 days ago | 1 comment

8. Woz Interview: the early days of Apple (foundersatwork.com) 7 points by phyllis 3175 days ago | 1 comment

9. Best IRR ever? YouTube 1.65B... (techcrunch.com) 6 points by sama 3175 days ago | 3 comments

10. NYC Developer Dilemma (blogs.com) 5 points by onebeerdave 3175 days ago | 1 comment

11. A Story About Not Going IPO During The Bubble (usatoday.com) 5 points by starklysnarky 3175 days ago | 1 comment

12. The Hardest Lessons for Startups to Learn (paulgraham.com) 5 points by phyllis 3175 days ago | 1 comment

13. Wired: The Desktop is Dead (wired.com) 5 points by farmer 3175 days ago | 1 comment

14. Participation Inequality: Encouraging More Users to Contribute (useit.com) 5 points by frobnicate 3175 days ago | 1 comment

15. Sevin Rosen Unfunds - why? (gigaom.com) 5 points by phyllis 3175 days ago | 0 comments

16. Business Intelligence the Inkling Way: cool prediction markets software (360techblog.com) 4 points by perler 3175 days ago | 1 comment

17. Small is Beautiful: Building a Successful Company with Less Capital (zdnet.com) 4 points by pg 3175 days ago | 1 comment

18. weekendr: social network for the weekend (weekendr.com) 4 points by askjigga 3175 days ago | 0 comments

19. Voddler Raises $2.2M For Virtual Cable TV (thealarmclock.com) 3 points by farmer 3175 days ago | 1 comment

20. PhotoShow: Broadcast Photos to Cable TV (techcrunch.com) 3 points by frobnicate 3175 days ago | 1 comment

21. Will Silicon Light Illuminate the Future? (technologyreview.com) 2 points by pg 3175 days ago | 1 comment