I use fitday.com and just access it through my droid when I'm out, but lots of people here use sparkpeople.com and droid has an app for that! I find that I use my laptop for calorie-logging a lot more than I use my phone, so it doesn't really matter.
I know lots of people pick 1200 b/c they've heard (here or elsewhere) that's the lowest they should go, and they want to go low and get quick results. I think what's most important is to find a calorie level that you can live with for a long time -- this is a marathon, not a sprint! I know I would go crazy on 1200 -- I'm losing at 1600-1700 with lots of exercise.
Someone on here has in her signature: "I'd wish you good luck but
luck has nothing to do with it." So I'll give you a "You go, girl!" instead.