@theonelaw
You have to wait for 1 month.
I'm now in hollydays in Brasil.

I had planned to put a video on youtube.
But nobody seemed to be interested on the first time.

But anyway: The hardware is described exactely in this thread. With my indications you will find photos of everything on ebay.

What I did is the work of a noob.

But for my friends on this forum I will put photos of my work. Everybody will see that I am an ignorant. But it works.
(I've to cut it off, because I've glued everything together.)

@Estel
I don't think that you will have problems with the serial-by-usb on arduino because it has a smart chip. You have only to adapt the script on the n900 to look at the usb-port instead of bluetooth. I think that's all. You send the infrared-information by a "print"-command to the n900 and the n900 receives it as ascii-text

EDIT: Estel, I've looked at the internet: Serial-over USB seems to be more difficult than I thought. I'm not the right person to answer this question.
Did you have a look at this:
http://www.circuitsathome.com/produc...uino-pro-mini/
http://www.circuitsathome.com/arduin...hield_projects