I tend to focus on the shoe department when I hit any Rack store.
The clear the racks percent off as Joy mentioned can be nice if you time it right.
THey do indeed carry some "made for Rack" brands, meaning it was never in a full line Nordstrom store. YMMV on those items. I've had good luck with some of the made for Rack Zella workout wear.
If you are a Nordstrom shopper you will know what brands / items likely came from a full line store vs made for Rack. I guess that is just dependent on if you're a Nordies shopper, but I do find the intelligence helpful in making decisions, knowing if something is a good deal or not, etc.
THere typically is an Eileen Fisher rack and I usually browse there for kicks, occasionally coming away with a find.
Good luck and keep us posted.