If I was only allowed to use the word "awesome" once a month, then this story would definitely get the nod for July, even though we're still only four days in.
Benheck.com forum user darkeru has managed to take the guts of a Nintendo Entertainment System and stuff them all into the shell of a game cartride.
He even added a small LCD screen, and is running the entire unit on three n-cell batteries. As for games, this baby comes with 99 of them built in, including Super Mario Bros. (pictured below).
Unfortunately, the mod won't be distributed to stores, so the rest of us will have to be content to live vicariously through its creator.

[via benheck.com]
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It's not the actual hardware, it's probably one of those NES clones...
You know the NES was the most cloned console ever, so it could be one of those on-chip versions.
If they fit a ps2 into that, I would be amazed, but a simple 2D console with GBA graphics, not that impressive.
GBA? I think you're giving the NES too much credit.