Hi llukkari!
It seems very interresting. As soon as I'll have some spare time I'd like to try your code. Would it be possible to have an example about how to manage some of the PIN's status (something like ON/OFF).
Also, I'd want to ask you what do you think about using a database in the middle and just querying the database to show the status of the Arduino PIN's (the values and the status of the PIN's would be pushed into the database using 2 services: one on the arduino and one listener on the webserver that registers all into the DB at a predefined time range).
The use of the database will avoid "overloading" with requests the Arduino board