With the first bundle, when they made over $1,000,000 USD they decided to open-source the games, but it's not known yet what they will do (if anything) this time around if hitting any new milestones.
With the second bundle for the five DRM-free games where you pay what you want, those buying the games for Linux are on average are donating more than twice as much as the Microsoft Windows users. The average Windows user is contributing $6.34 while the average Linux user is in at $13.63. The Mac OS X gamers are in the middle at $8.45. The largest donor as of this evening provided $2,000 for these five indie PC games. The $900k+ total is so far coming from over 121,000 sales.
Unless the Humble Bundle infrastructure suffered a setback to the scale of LGP's server incident, nothing is stopping them from hitting the one million dollar mark more than likely on Saturday. There's still three days and eighteen hours left before this offering is set to expire.
Those interested in these multi-platform games can go to HumbleBundle.com.