Thank you for building this. I admire the simplicity and elegance. Would be cool if the "Mentioned 2 times at Hackernews" was hyperlinked to the mention. Can this be done?
As quite a few have asked via the comment form: it's a nginx + passenger + ruby 1.9.2 stack, with solr for indexing, mongodb for data back-end, rails fragment caching in redis, and a warmup script to fill the caches.
Well I'm more used to Redis, as I've used more than a couple of times with Resque (job processing in Ruby).
I started the crawler behind HackerBooks with Resque and Redis, but ended up saving some RAM by going back to a simple daemon. I reused Redis to provide the caching.
on that note,
hackertext, hackermenu, hackerledger, hackerconventions, hackerelite, hackerplans, hackermanifest, hackerstatement, hackerplay, hackersection, hackervolumes, etc... all seem to be free. (shameless plug for nametoolkit.com - downvote me if you wish ;))
It's fairly simple so far and more features are planned.
I'm submitting early on to get some wider feedback. Thanks to all the HNers that reviewed this before today already!