I want to get it for either the 360 or the DS. Hopefully I'll get that for my birthday (or a 250 GB 360 Slim and another copy of Mass Effect 2 since my younger brother hocked my copy I got as an early birthday present last year).
Actually I have it on both my iPod touch AND on PC/Mac (via Steam). "Both" wasn't a choice so I chose iOS. I'm surprised more people haven't chosen iOS in the poll because I think control-wise, PvZ is a perfect portable game.
I own it on the PC. Infact it is the only PC game I play. I beat the story but then had to reinstall windows and lost my save. While normally such an occurence would make me a sad panda I am actually kinda happy about it. I probably wouldn't started playing the campaign again otherwise.
I played through it once on a friends computer, and I don't care for it. It gets a free ride on cutesy graphics and whatever addictive qualities are inherent in the tower defense formula, but its just not a very good game in its genre. Sol Survivor is better than it. Defense Grid is much better. Hell, pick any random tower defense UMS map in starcraft or WC3 and its better than plants vs zombies.