Thank both of you for your replies, and thats right, we should requiere validation, but sadly it is necesary, I always say 'if something does the job, use it' either arduino, pic, PLC, whatever, I love to learn as much as possible and share that knowledge (when possible).
The last week, the company that i work for (AAM), authorized a project for a custom made access control based on Ethernet Arduino R3, there will be 4 entrances entirely automated and controlled by these tiny mighty buddies. No details about it enterprise secret (4N35 to read inputs, some MOSFET 1RF540 and high power relays, a tiny webpage to configure it, SD card to hold the log and a RTC to keep track of the time 8))
Best regards.
Sorry for the delay, I was pretty busy at work