I like the gardening section best, try going off season for the best deals. Other than that they have a good paint section (although for some reason it always takes longer than you expect), the staff can match any color you want and they have a wide selection of products so you can find pretty much anything you need for both indoor and outdoor.
It is a good place for light bulbs, (for those funky lamps with really weird light bulbs), it is more a DIY place I'll admit so knowing what you need and or being patient whilst looking for the someone to help you out, will keep you from losing your cool.
They can also cut a lot of things to measure, saving you money and time, again come prepared with what you need and they can help.
I also suggest you open an account if your doing a big project, it will save you time by allowing your workman to just pick stuff up, and a good way to keep your project accounting in one place.