RK: Brad Fitzpatrick
LiveJournal used to be the king. Nowadays with Facebook and Myspace it's moved down the totem pole. However, being king for a while did produce some cool stuff that Brad (and team) has been graceful enough to share. Probably the most popular is memcached, but MogileFS is pretty damn cool too. I also get a kick out of reading the history of their crazy LiveJournal server architecture.
His personal website: http://bradfitz.com/
Categories: Respect Knuckles