I know this thread got necrobumped, but I'd just like to comment on the above post from Vod--it's the first post by him that I've seen that actually references bitcoin, though I'd always assumed he was an old-school owner of bitcoin, whether by mining or purchasing. 

I see videos from one particular user on Youtube who shows how he's mining bitcoin on his Raspberry Pi, and IIRC he uses USB stick miners like the old block eruptor.  Man, the old days must have been something and I wish I'd been into bitcoin back then.  At least you can still mine some altcoins on a PC and then trade them for BTC, but it's not quite the same thing as being able to mine it directly from your computer.