Personally I don't think I'm gonna get any "official" game storage for the DS. I've come up with a few ideas that I think will be a lil better and prolly cheaper for most folk's needs
At Home Storage:
Buy those stamp collector binder sheets (cards will fit in these nicely) and put them in unikeep binders.
http://www.unikeep.com/Products/index.htmlIt would be very easy to find your games in this manner. Personally I keep instructions in boxes on a shelf so I think this would be super ideal.
On The Go Storage:
They make some really nice cases for compact flash and other digital cam media card types. I saw some aluminum ones the other day that don't have "fitted" card slots inside, just that foam type stuff you typically find in a gun case. I think those would do nicely for travel in a pocket or bag.