So many I/O pins....It's like Christmas!
for an arduino t-shirt
You mean the MiniMega t-shirts launching out of my t-shirt cannon?! Oh wait.... time to make a t-shirt cannon!
allow headers (and connected cables) on either side.
Possibly sell with cables (an an option)
I thought it'd light up during upload but no... Is it meant to?
Initially I planned for the headers to only be installed the way you have, but the more I though about it, the better it would be to install them on either side.
At a minimum, cables with a single row breakout on one end that will work with a breadboard.
Yes it is. hmmm... I am pretty sure I tested those LED's before I sent the boards. How to debug...
First thing to check is if I didn't reprogram the FT232. You can download a config utility from FTDI's website that allows you to configure the CPIO pins of the FT232... CPIO3 should be set to RX/TX. But now that I think about it, the default is PWR so it should stay lit if I didn't reprogram it.
Next, maybe make sure I didn't install it backwards. If compared to the power LED it should be flipped 180 degrees.
Last thing I can think of is maybe that pin of the FT232 isn't making contact with the board. I guess first try putting some pressure on the FT232 while uploading a sketch and see if that helps... otherwise maybe put some solder paste on the pins and run your solder iron over all of them. (make sure you have some solder wick on hand... just in case )
If none of those solve the problem... then maybe the resistor or LED is bad.
I like the permanent soldered idea because it wouldn't add much thickness to the boards. Just 2 pcb's making an Atmega sandwich.
Almost looks like those old IDE cables!