I think I was distracted last week with the announcement of Humble Bundle 11 because I hadn't realized how good the Humble Weekly sale looked. If you pay $15, you'll get 12 adventure games which works out at just over $1 a game. Best act quick as the sale only runs for another two days.
So breaking it down, you'll get four games for whatever price you want, another seven games on top of that for $6 (including games from the Book of Unwritten Tales and Deponia series) and if you pay at least $15 you'll get The Raven - Legacy of a Master Thief as well.
That game costs $24.99 on Steam right now, so even if that's the only title that takes your fancy, you'll still save $10 on the price.