Yeah, a bunch of buying. Yesterday on bitcointalk.org someone mentioned a $200K buy order that caused the BTC value to jump from $15.70 to over $16, but obviously that's only a part of the increase from $14. If you mess with bitcoins, it's a good idea to read bitcointalk.org regularly, as it contains all the news, gossip, scam reports, etc. Overall bitcoins are up 60% since August, so if you've been holding onto coins, that patience is paying off.