The Temple of Elemental Evil is a single-player computer game wherein you lead a group of adventurers through the classic module. Developed by Atari Software and Troika Games, it incorporates the full 3.5 rules (well, nearly). Now, typically I would avoid such games because I know they're time-sinks, but this one was given to me for Christmas.
I've found that the combat system works very well at allowing you to do everything that is in the D&D 3.5 combat rules. When I started describing this to Mr. Analog, he suggested that it would be a great way to learn all the possibilities of D&D3.5 combat. So I looked around a bit, since I was looking for help on how to finish a non-combat quest, and I came across a fully-functional demo version.
Well, there are really two demos out.
The first demo (http://www.gamespot.com/pages/gamespace/download.php?pid=589356&sid=6083445&mode=latest) is size-limited, with only one village and one dungeon area.
The second demo (http://www.gamespot.com/pages/gamespace/download.php?pid=589356&sid=6085468&mode=latest) is time-limited, but includes all the maps required to finish the game. They only give you six hours to do it, though.
If you want to give it a try, I recommend the game. Just remember in combat to right-click on the character and explore the "radial menu" that comes up.