Now, let's try and be fair in both directions here.
As shadowfax said, iPC is wrong; Apple makes lots of things themselves. No, they don't necessarily manufacture or even design individual components, but the PowerBooks, iBooks, and every other computer they make are NOT just rebranded OEM parts; they design everything then outsource the manufacturing. The processors, hard drives, LCDs, and some internal chips of those computers are just parts off a shelf somewhere, but the motherboard and overall design is Apple-only, and Apple does sometimes use custom chips as well.
Same for the iPod; sure the OS, processor, and hard drive are available elsewhere, but if it were an OEM rebranded product you'd be able to buy an identical MP3 player without an Apple logo on it for $50 less from another company... which you can't. Not so for actuall OEM rebrands, like most of Dell's monitors or Gateway's consumer products--they just take a piece of OEM hardware and slap their logo on it.
That doesn't mean that OEM rebranding is a terrible thing; that's basically what Gateway's trying to do with their entire business these days, and Dell frequently if not always does the same thing.
And I think it's been established that if you read closely and ignore the positively massive number of randomly-generated buzzwords, l's products are technically feasable.
What, basically, they seem to be selling is every PC speedfreak's dream machines--every possible overclock and high-end hardware add-on in the book. And the prices are right in line with that (you could do a heckuva lot with a G5 for that much cash, too). Sort of like Alienware taken to the next level, which is kind of a fun idea, although I have my doubts many people are going to drop that kind of cash for that sort of system instead of just going with a loaded Dell Workstation or build-it-yourself.
HOWEVER... just because it's ok and possible doesn't guarantee this company is for real (though that's a heckuva lot of work for fun), and even if they are it still doesn't mean that they're not a bit on the shady side.
Giving them the benefit of the doubt and assuming they're a legit company with legit products, I still wouldn't buy anything from them because: a) Their site feels "shaky", particularly the online store; if I were to buy something I'd call it in since the cart doesn't feel right. b) Hiding simple overclocking behind a bunch of made-up jargon seems a bit iffy. c) It's such an obvious Apple copycat that it personally annoys me. d) They go a little too overboard with their techy terms. "Accelerated Hyper-Threading Extreme Edition" when "Overclocked P4 with Hyper Threading" would've done. e) Implying your computer has 16GB of RAM when it really only has 4GB and a 12GB RAM drive (which is wildly different) is rather dishonest, and there are other things like that scattered around.
The whole thing strikes me as the hardware equivalent of BuyMusic.com--A company tries to copy the look and functionality of an Apple product, and if you read superficially it looks like a better deal, but once you look more closely although they aren't technically lying it's just not the Real Thing(tm).