Funsol Solitaire Gold 7.0
This has over 600 solitaire games with automatic card sizing to show the largest cards possible.
It even has a search engine to help you find exactly the game you want.
It also includes a right mouse button auto-play feature. There is an unlimited undo and redo feature with snapshot and restore move. Favorite games are accessible from the toolbar and each game is saved so you can try again later. Each game has its own database of the last 1,000 games played.
This uses true color graphics, smooth animation and DirectSound. Registered users can download hundreds of card backs, backgrounds and card sets.
This game is playable for 30 days.