Typically, about a week after a new Humble Bundle launches, the indie game distributor adds a few more titles to the mix as a reward for those who contribute above the average price. This time around, Another World, Funky Smugglers, and Raiden Legacy are the ones topping off the pack if you've pitched in $5.53 (at time of this writing) or higher.
With the new additions, this brings the total number of titles up to nine, and at five and a half bucks, you're looking at around $0.62 per game. Not a bad deal. Six days remain on the clock in case you need to wait for your tax refund to come in or something.