Link I got this link from a friend and although it does interest me, some part of me is worried it might just be a scam. The processor in those things look really powerful for its size and for the price. Has anyone got any experience with these?

I haven't had any experience with them myself, but Hack a Day have featured them in the past.

Anyone know of a similar product that has built-in wireless networking? The whole built-into-a-wall-wart form factor isn't that useful if I have to plug it in directly next to my router.

you could use a USB dongle on that one for wireless

It doesn't seem unlikely to me. The 88F6281 datasheet is pretty extensive, if not as good as Microchip's documentation. If it's a scam, someone has invested an amazing amount of effort into it.

Personally, I don't see that much point to something that can only connect to ethernet and USB; it has so little IO that it'd be almost useless. Although it has a less powerful processor, this appeals much more to me.

I think this one would be lots more fun.