How do I choose which lands to tap?

Whenever I cast a spell, the game automatically taps an appropriate number of lands. However, it's often important to tap specific lands to leave correct mana available for additional spells. The game doesn't always do a very good job of picking the right lands to tap.

Is there any way I can manually choose which lands to tap when casting a spell?

For the sake of simplicity and quicker multiplayer play, Duels of the Planeswalkers 2011 and 2012 do not let you select which lands to tap.

This is had been a bit of a contentious thing in the official forums since the launch of the original game, and was not addressed in Magic 2012.

However, this deficiency will be addressed in Magic 2013, which allows manual tapping across all platforms:

• On Xbox 360 and PlayStation 3, you press down on the left thumb stick.
• On iPad, you tap the land you want.
• On the PC, you press the left Ctrl key.