Played through The Whispered World recently. Old school style adventure (2d). I tended to skip through the spoken dialogue tho and just read it most of the time. Haven't got around to finishing it but on the last chapter. Pretty good tho.
Sam & Max series isn't bad. Played the first Wallace & Grommit adventure (lol) and it was OK. Most of the Telltale adventures are probably worth a go..haven't tried Strong Bad series yet tho
Some more ideas: Overclocked, Perry Rhodan, Sinking Island, The Lost Crown, Syberia 1+2. Theres some Sherlock Holmes games that aren't bad. I liked Dreamfall but its not really much of an Adventure, more like a interactive story
I don't really play that many adventures now tho..don't think the quality is as good as they used to be but there'll be some good ones I haven't tried yet.