Time for some more free games. There's a great community that make free classic adventure games in the vein of Monkey Island and The Dig over at Adventure Game Studio. Be sure to check out their forums. I'll post some of their best efforts below.
6 Days A Sacrifice - A well made adventure game by Yahtzee. Part 4 of the John DeFoe series.
Apprentice II: The Knight's Move - Very nicely illustrated and animated.
A Friend Indeed - Interesting pixel-art styled adventure.
Cirque De Zale - Nice little game where you play as Alexander Zale.
If that doesn't appease your classic adventuring needs, then check out the top twenty adventure games list.