Via: Engadget

"After ages of monopolizing most of its add-on market for the 360, it looks like Microsoft is letting up a bit. Datel just came out with two new MAX Memory cards that are compatible with the console, in 2GB and 4GB capacities. That's all well and boring, but the potential excitement here is that cards can also be augmented by a microSD slot, with support for up to 16GB cards, for some trippy card-within-a-card hijinks, and what might be one of the best portals for hackers yet. Or perhaps not, since it seems likely that Microsoft wouldn't open up what it knew to be a major security hole, and given the numerous other interfaces with the console, the 360 is still pretty well on lockdown for the average user, after almost four years on the market. At least this should provide a slightly more flexible hard drive alternative for folks who don't want to shell out for Microsoft's overpriced humps. The Datel cards start at $40."

------

After checking Gamestop to see the paltry selection of memory card sizes vs the price of official Xbox 360 memory cards, this could be quite a nice alternative for those with core/arcade Xbox 360's. Even if you didn't use micro SD cards to expand the storage space of the memory card, the storage sizes out of the box already trumps the official cards.

Oh, that sounds like a good deal. 2GB & 4GB microsd cards are cheap now.
You could fit some decent size DLC on there and play at a friends house without having to redownload it.

i will keep this in mind (still have 101GB left)

I picked up a 2gig microSD card (with a USB input thing) for $12 like two years ago. SD cards are so cheap so hopefully these cards work for those that get them.

No thanx why get a memory card when the harddrive is 10 times better makes no sense really. My 120 HD will do just fine! This could be good for if I wanted to let my brother try dlc I have for a game or some sort but not really a must have.

It's more of a replacement for the official Xbox 360 memory cards and how you have to pay like $50 for 512 megs when the cheaper memory card mentioned in the OP costs $40 for four times the space and that's not even counting how it's expandable by MicroSD.

So for Arcade/Core Xbox 360 owners and those who want to take game saves and XBLA games (and whatever else you can store on them) on the go, then this seems like a better alternative than the official memory cards.