Thank you everyone for the quick replies. I'm not concerned about getting in trouble for the ROMs; piracy is so ridiculously widespread that you cannot easily enforce any regulation relating to anti-piracy. If I get in trouble for the ROMs it's because I drew attention to myself as possessing them. Even then, I'd have to go out of my way for that to happen.
The hardware itself is what concerns me; I actually already ordered one and received it today (the Acekard 2i is fantastic!), but as I signed the little form stating the package had been delivered to me when the mailwoman arrived, I thought about the future repercussions of my purchase; would the US government suddenly crackdown on the sale and ownership of these devices and arrest anyone who possesses them? That's really silly to think about, and as a previous poster noted, cracking down on me, or all of us really, would be a waste of resources; I would end up being nothing more than an example for people to fear (i.e. "Oh snap, if he got arrested for it, I might too!").
Heck, the packaging my cart was shipped to even said, in handwriting, "flash cart", and it went right through US customs (though that probably isn't a huge feat...).
I dunno, I guess I'm just paranoid. I don't want to be sitting in my dorm when all of a sudden the police show up out of nowhere and try to arrest me. :/ Silly, silly...