@hek ok but it could be useful to have localized sub-forum if community is big enough (French, Deutsh, Spanish ...) with some moderators. Sometimes I don't answer because it takes me more time in english.
I agree. According to the schematic, you do use the MCP1703A-3302 as a voltage regulator, which is rated to 250ma. It seems that many problems are easily avoided when there's a more than ample power source.
Also, for whatever reason, the Arduino IDE doesn't seem to support the highest baud rate that's apparently possible with the FTDI. It does though with the CP2101.
@martins - No, not at the moment. It has been asked before but I have never got my head around it.
As i told before, you are happy to develop it yourself. I have some other things in my list but in the future maybe