Okay, I don't think anyone else has had this problem. I left my Dsi out on my nightstand with the acekard 2i inside for a day. I just picked it up and ejected the cart and noticed a oily type substance on it. It was also on my Mirco sd card, a little inside Slot-1, and inside the acekard itself. Now here's the weird thing. The oily stuff was only a little bit around the slot and no where else on the system or on my table. There were no liquids or anything around the system at the time. The smell of the substance was not sulfury or citrusy, which I know are indictive of battery acid. Any clues? Edit: Just for a bit of added info, I have a clear case around the DSi. The liquid was trapped under the case so I didn't notice right away when I picked it up. Also, the smell reminds me motor oil or something like that.