if you login the website and hit the myshop button you get to see a ton of tabs, item compound, pet compound, tempering, auction house, item decompound and mileage shop. ingame stuff that can all be done trough the website, which is awesome
the web auction house lets u choose between a ton of options too, like view your galders in the bank. or items in inventory.
you can view items people put up for sale for cashpoints/galders, you can sell galders for cash, or cash for galders, whatever you like really
ofcourse u can also buy cash for real money still, which is made extremely cheap (8k for 3 euro)