I can't recall offhand if any of our content has ever made the front page or not, but we've definitely gotten some traffic from HN. So far, the biggest thing that we've gotten from HN is traffic to our blog[1], and a little bit of traffic to our main website[2]. And possibly a few subscribers to our announce list.
But, we're a B2B enterprise software play, and our product isn't even in GA yet (it's all on-premises deploy at the moment, not a SaaS offering). As a result, we can't claim to have converted any customers yet as a result of any HN links.
No investors, potential partners, etc. have reached out to us either. Of course, on the flip side, we aren't trying to raise money right now, not are we looking terribly hard at partnering opportunities. We're heads down, nose to the grindstone hammering on product/market fit and creating great products.
Edit: to give some solid numbers... between Jan 23 and Jan 30 of this year, we had 140 hits to our blog. 55% of those were referral traffic, and of those 29 were referred from dzone and 19 were from HN. The rest was 1 or 2 hits from a mishmash of other sites like LinkedIn, Quora, etc. Note that that was from a post that never got any upvotes on HN and disappeared off of the "new" page pretty quickly.
[1]: http://fogbeam.blogspot.com
[2]: http://www.fogbeam.com