Bitcoin (https://bitcoin.org) started to make the idea of a cryptocurrency popular. What is missing so far is an intense discussion among Sharia scholars.
What makes Bitcoin unique is, that it is a) created by a computer program b) that it is created and verified by a decentralised process, the so-called 'Blockchain' technology (https://en.wikipedia.org/wiki/Block_chain_(database)), which is solving a practical problem for the first time: To enable trust and accounting without a central ledger, such as a central bank. c) that it faciliates payments quick, efficient and discreet - while the latter leads to accusation of misuse, e.g. for gaming, drugs, terror finance etc.
How it can be seen from an Islamic perspective is not widely discussed, despite it deserves the attention. What we find in search engines are some discussions and also an initiative, which calls itself a bank (https://bitcointalk.org/index.php?topic=21732.0).