It's 10:30 and I need to head to bed, but I should tell ya'll to go ahead and buy/ try the demo of Plants vs Plants on steam.

You have your lawn, in which you plant different plants that have different effects (Cherry bombs kill all nearby zombies, walnuts act as shields, etc) to prevent the zombies from invading your house and eating your brains.

In order to plant the flowers, you need sun energy, which comes down randomly from the top of the screen, and sunflowers distribute them as well. To be fair, cooldown times for each plant are put into effect.

Real time strategy game that can be considered a "my first strategy" kind of deal, though the levels get pretty difficultabout halfway through.

http://www.youtube.com/watch?v=CHAbHz8iYHc&feature=channel_page