It would be very useful to store somewhere (session, cookies or even in database if you think is necessary) the settings for a user.
For example, the Edition column is not shown by default and each and every time i have to go and check it.
Could be useful also if the sorting option could be saved.
I don't thinks it requires a lot of coding, but the improvement will have an immediate impact.
Not to forget, another one: if i select an entire row in my inventory and want to move it to the tradelist, i would expect all the cards to be copied.
Right now it only moves one copy of the card.
What do you think?