PvZ is definitely the most time I've ever spent on a "casual" game. It was so addicting! I was even trying to collect every different plant for my zen garden (only facing to the right, mind you), and my tree of wisdom was like 800 feet tall! I heard something special happened if you got it to 1,000 feet, but I never found out... Oh, and for those of you hoping for a sequel: http://www.popcap.com/plants-vs-zombies-2 Ding!
I had it on my phone, but got it on PC just so i could play endless mode. It's crazy seeing people on youtube going past 10000 waves, I can't even pass 100 XD
I don't know about you, but PvZ 2 just came out in the US and I've been playing it non stop since. PvZ totally deserved to be game of the year, it's so addicting!!