I usually check this site. They blend more regular games in, but they tend to review and talk about current "adventure games". Otherwise anything from Tell Tale games (creaters of Sam and Max seasons, monkey island remakes and so on). Also, if you want to try classics, I GOG.com has a growing library of good ones like Gabriel Knight. And lastly, ScummVM is good for emulating a majority of the classics.
Also, check wikipedia for their lists and whatnot. They don't have a Wii specific one, but it won't take you long to check all the games in their general point and click adventure listing.