The person who invented the bitcoin has remained annononous altho rumor belives he owns the worlds bigges exchange mtgox, you can buy a few things with bitcoins wordpress except them amazon are in talks to except them theres debit cards for bit coins very new in there infancy the problem with bitcoins is transactions have to be verified which can take up to a hour, the main selling point of bitcoin is the annononous aspect of the transaction, the system is run by the miners. The 21mil coins was original written into the bitcoin code and cannot be changed! There are load of project to make bitcoin more sustainable such as bitcoin nodes in space to keep the blockchain going in thr event of miners stoping mining, bitcoin check out systems such as okpay, acceptance by governments the uk now imposes a tax on income from bitcoins!!! Litecoin on the otherhand have much more practibility of being adapted intona real life currency as verification is much much faster.