Does someone know if an extension cable for that "square" USB connector (don't know the name) exists?

You mean something like this panel mount, Female B to Male B, USB extension cable?

Right! This is exactly what I had in mind!
Many thanks, I'll see if I find something similar in Europe... otherwise I'll try ordering oversea. I know it would take 3-4 weeks, but could still be compatible with my development time (delivery for Crhsitmas!  ).
Thanks to all.

Thanks a lot, good that I realised and asked before doing 
Soldering a wire could be a simple solution, but if possible, I'd like to preserve the Arduino board for other projects, so I'm thinking to realise my prototype on a breadboard shield. This is why I initially thought of using the V_in pin.
I'll move to a double connector, putting the Arduino board inside the box instead of right behind the planel. Mmmh... this means I also have to double the USB connector if I want to access it from outside. Does someone know if an extension cable for that "square" USB connector (don't know the name) exists?

I have to drive some high power LEDs (using TIP122 darlingtons), for a total current around 2 A on 12 V input. I'm wandering if I can drain this current from the V_in and GND pins of the Arduino Uno board, just connecting a 12 V supply to the Arduino board and using it to power both board and loads, or if there is a (lower than 2 A) current limitation on V_in. In the former case I presume I have to "duplicate" the power supply connection and provide current directly from supplier to loads, without using V_in pin...
Hope my question is clear enough.
Thank you very much for help.

P.S. There was a similar question here http://arduino.cc/forum/index.php/topic,16348.0.html but I don't think the answer given there is right since there should not be any regulator between supply and V_in on Arduino board. However, there is between supply and +5V (this was the answer) but that's a different story... My concern is mainly about burning some traces on the PCB with a current as high as 2 A or so.

Eccomi qua, mi chiamo Leonardo e quasi per caso mi sono imbattuto in Arduino mentre stavo cercando un modo per realizzare effetti di luce per il mio presepe. Adesso sono armato di una breadboard, una serie di LED bianchi ed RGB e qualche transistor, oltre ad una board Arduino Uno.
I primi risultati sono molto incoraggianti e nel frattempo mi sono realizzato anche un utile scatto remoto IR per la mia fotocamera (per quanto un po' fuori tema rispetto al presepe  ).
Poi, essendo anche un eli/aeromodellista, chissà che ci scappi prima o poi anche un Ardupilot...
Solo il tempo (quello libero a disposizione, che non è mai abbastanza, oltre a quello del calendario) dirà cosa riuscirò a fare con Arduino.
Per ora ciao a tutti.

tapatalk?

 http://tapatalk.com/

I vote for it. And ask all other mobile users to give their vote, too!
 

How can I manage the B exposure with my Pentax K100D Super? According to manual as far as the IR is “on” the shutter should remain open, but this is not the case with the library. I’m afraid the IR signal is given just “one shot”. Is this possible? Did anyone succeed in using the B on Pentax with MulticameraIR?
Thank you so much!
P.S. Some Pentax cameras may be configured such that the B works as “one shot opens – next shot closes”, unfortunately not mine

Qualcuno è riuscito a farla funzionare?
Purtroppo la K10D non permette di impostare
Grazie la posa B col doppio click per apertura e chiusura otturatore.