Announcing
https://minero.cc, a JavaScript plugin for mining Monero (XMR) in Web browsers.
It can be used for solo mining without installing software, and it can be integrated in your website and use your visitor's CPU to mine Monero for you. It is a good alternative to ads for monetizing websites.
The technologies used are NaCL and WASM, which allow safe execution of efficient applications on modern browsers. Because it's safe, it can run without asking the user for permission, so it can run in the background without the user noticing.
You get paid fairly for the amount of hashes that you contribute. You get 80% of the mining reward and the remaining 20% goes to cover the running costs of the service. This fee is lower than what similar services charge.
I'm the main developer of the service and I'm looking for feedback. Happy to answer questions too.