I also use gtasks because it auto sync's between gmail calender and google devices (my tab and my droid). List is always backed up to your google email/calender. You can set reminders, it's light weight (doesn't bog your phone down like Astrid) and has 2 desktop widgets. You can setup multiple lists. I also use it for a grocery list. Best one on the market in my opinion.
Will also be trying this app! Thanks for your advice. Are you using the full paid version or the free? Any noticeable differences?
Here's a good question: Does it allow for repeating apps? I am really looking for something that can be used as a Daily Planner; I really need a routine!
I've used both gtasks and taskos and at least for now have stuck with gtasks. It syncs with google better. There are a lot of things I liked about taskos, but the sync never worked consistently for me.
As for groceries, you have to try ourgroceries, it's great and can be used online or on your phone, and best of all, the list can be shared nh multiple people!
Take a look at mobisle notes paid version. It syncs with google docs, allows you to make checklist or plain text. It also has a widget that let's you add notes to desktop. I use this everyday, I have a doc that is named quick notes, and I add my todo items for that day in that note. I have tried every note and task manager there is, and out of them all, I found mobisle notes was the best for me.
I have a list of great apps that serve that purpose. My favorite is calengoo, which incorporates google task as well as google calendar. I did a review on this app, as well as other apps like this. Take a look!