I still cannot imagine how they can do this, thinking about their big big collection, always evolving month after month. But I'm sure this won't be a problem for these big companies, also ASOS has a huge collection always evolving and they're great.
I like going personally to ZARA, trying the clothes I like, or simply passing by looking for inspirations. But I admit that having an online shop at disposal it will allow people to find what maybe in their city shop hasn't still arrived, or worst, has already finished. That's great!
I've taken a look at the web, as soon as I got in the office, while nobody wasn't here yet. It seems a good website. You can browse all the current month collection, divided in woman, man, kid, trf (then to the "garment" sub menu), or choose to see the last week's arrival. Any garment has different pictures, showing how to wear it, how to combine. That's not a news, for shopping web addicted, as quite all online shops are arranged in this way. But it's simple and immediate, and that's essential.
So, what are you waiting for? Jsu digit http://www.zara.com/ and enjoy! ;-)