[wbaccus]

I also don't use OmniFocus for my grocery shopping. I don't need to be reminded to go grocery shopping since that's something I do each week. I do need to be reminded that I need to pickup a new hammer when I'm at Home Depot, etc. I have a context called Errands and I put stuff into that. I had been assigning some contexts, but I think the method described above with the name of the store in the action is probably a better approach.

For my grocery shopping, I use tadalist.com, it works GREAT on my iPhone, and both me and my wife can add items to it remotely.