I know that lots and lots of samples, with patterns available, is inspirational for me. Have a wide variety of projects on display with classes available. Even if they seem simple to do, it's fun to have a dedicated time to sit down with friends and actually complete something.
Have a knowledgeable staff so that you can offer a class for customers who are having difficulty with a project or pattern and just need a little help for a small charge. If it lasts an hour or two you could accommodate more than one person.
Be open every day. If my LQS was only open for a few hours on a Sunday or Monday, I would make time to be there during those hours. Be open late one or two days a week. Have consistent hours, so that I know that you will be open if I make a special trip.
Offer customer involved exchanges.. charm squares, 9 patches, half square triangles, strips, etc.