If your site is protected by CloudFlare (like HN is), you are automatically protected from this vulnerability (see: http://blog.cloudflare.com/staying-ahead-of-openssl-vulnerab...).
Although there's still the other 103 weeks this was vulnerable to worry about.
>>There is no total of 64 kilobytes limitation to the attack, that limit applies only to a single heartbeat. Attacker can either keep reconnecting or during an active TLS connection keep requesting arbitrary number of 64 kilobyte chunks of memory content until enough secrets are revealed.