When DP and I left southern CA to move back to MN there were only a few things we missed: first and foremost, our friends, then the ocean, cheap produce available year-round and ... Trader Joe's. We whooped it up when they finally opened one in a nearby burb and whooped even more when they opened one mere blocks from our house.

About the only items we generally do not buy there are meat products (buy from local farmers), although we do love the burgandy/pepper marinated lamb roast. We stop at least a couple times/week as they have good stuff and are cheaper than regular grocery stores. Some of our favorites or stock purchases:
Greek yogurt
Tuscan bread
Garlic roasted hummus
oriental crackers
multi-grain crackers
salsa
bags of spinach and arugula for us
frozen spinach for making our dog's food
baby carrots that our dog eats for treats
dried chicken breasts, again for the dog
McCann's steel cut oatmeal
various frozen lunch items (love the new 4-cheese pasta)
chicken stock
roasted red pepper/tomato soup
pasta
olive oil (for all-purpose use; I buyer a nicer one from a local grocer for use where the oil is the star)
ham & gruyere tart (pizza-like item that I swoon over)
soy ice cream
biscotti
lava cakes (soooooo good!)
apple blossoms
shampoo
soap
face lotion and hand lotion
fresh-cut flowers
wine and beer
charcoal

I just stopped last night and picked up some bell peppers for use w/dinner this week, more carrots for the dog, tuscan bread, and some items for upcoming holiday baking including organic canned pumpkin and a 5 lb. bag of russet potatoes for lefse. We love TJs.