Ooh, Klondike Chromatic! Your favorite!
Mondo Solitaire packs 101 games (with tweakable rules for more than 200 total possibilities) into one $10 app. The graphics are smooth, the controls are easy to master, and the help is actually helpful.
Plus, Mondo can teach you about games you've never heard of. (Even a few games your octogenarian Uncle Morty isn't familiar with, we'd wager.) Xerxes? Miss Milligan? Swamp Drainer? They're all here.
The landscape-view interface is nice, and you can pick a game from the menu by flcking through them in Cover Flow style. Or just tap the Surprise button in the menu and the game will pick a random mode for you to play. That's how we discovered our new favorite, Grandfather's Clock.
For variety and polish, it's the best card game we've played on the iPhone yet.
101 varities of solitaire, shown in Cover Flow. Great graphics.
Very occasional crashes. 