It's nice to have some more recommendations. I've got 2 credits to use at BigFish, and I haven't been tempted by the newer games.
The games I played recently that I liked are:
Pahelika Revelations - some really good puzzles
Grim Tales The Legacy
For those of you who like jigsaws, you can't beat Peter's Jigsaw Puzzles. I've been playing those more than traditional casuals.
http://www.mulawa.net/pj/index.html
I also loaded the Puzz3D games onto my Win 98. First you complete a 3D jigsaw, then you get to go inside what you make for a FMV adventure game. Lots of fun, there are 5 different Puzz 3D games.
http://metzomagic.com/showArticle.php?index=407