Angie has a TON of great posts on NAS from past years. I learned so much from reading them. She also will blog about her NAS picks, so you will get her great expertise on specific items to check out at the sale. Here are a few past posts:
http://youlookfab.com/2010/07/.....sary-sale/
http://youlookfab.com/2009/07/.....ider-tips/
http://youlookfab.com/2010/07/.....most-here/
Every Nordstrom store is different in terms of how they follow the rules of who is allowed to preselect before the sale's official July 15 start date ~ and even within a store, different SAs interpret the rules differently. It used to be that you needed to be a level 2 Nordstrom cardholder to do that, but even then some stores allowed people who didn't have a card to do the presale and others allowed it even if you weren't a level 2. I think this year they've changed it officially that any Nordstrom cardholder can make a presale appointment, regardless of level. The Seattle flagship store, though, follows the preselection rules to the letter.
Last year was my first NAS, and I had a blast. I preselected TWICE (I am a cardholder) and found it a wonderful & efficient way to overhaul my wardrobe. There were some cases where a few items on sale during NAS sold out, then well after the sale were restocked and eventually offered at a lower sale price than the NAS price. Some YLFers followed up with Nordstrom about it and were credited the difference ~ yet another example of Nordie's stellar service. As far as I'm concerned, price variations occur everywhere and we just have to decide if an item's price is worth it to us at the time.
I already have my presale appointment set up for July 5. I can't wait!