Any good hidden object games?

Try Sinister City and Alchemy Mysteries, these aren't Artifex-mundi quality, but they are pretty cool. Sinister City has an absurd story, I think that's why it has bad reviews, but I liked it :p

Also check Midnight Mysteries (1, 2, 3 and 4).

And of course, all of the Artifex Mundi games.

Hero of the Kingdom turned out to be a nice surprise for me. It's a different kind of Hidden Object from the usual "pretty picture + shopping list" set-up, but it's still Hidden Object in its own way. Those egg/mushroom hunts can take a while.

EDIT: And then there's Melissa K. and the Heart of Gold. The Hidden Object aspect of it is kinda mediocre, sometimes bordering on frustrating even, (and the devs outright said they don't know how to fix the infamous 5 broken achievements if that bothers you,) but it has many other rather original mini-game ideas and game-play elements to make up for it.

The Brink of Consciousness games are personal favorites of mine.

I liked Pickers! :)

I don't play a lot of of HOGs but I was charmed by the setting and story of Where Angels Cry, loosely based on one of my favorite novels, The Name of the Rose.