I use a free list app called List Ease. It's nothing special, but I like it just fine. It synchs between my iPhone and iPad, so that's helpful.
That is helpful. The stupid Grocery IQ doesn't do that. Ideally, I would like one that H and I can both add to but I don't know if that is even a possibility.
I use Cozi for my shopping list. You can have more than one person on the acct, so (theoretically) DH can add stuff to it from his phone too. Usually he just texts me what he wants though.
And then I use Target Cartwheel and their app mobile coupons to try and save some monies.
I have a Google doc that I shared with my H. It contains our weekly meal plan and grocery list, with extra space for things to buy next week that we can add to as we remember.
I use Ziplist. You can create the list on or phone or on the website. If you do it on the website it will tell you if anything on your list is available at local stores. You can also share the lists and create them for various stores.