Can anyone point me to some engineering drawings for the Duemilanove PCB, NOT Eagle or any other proprietary format, just JPEG, PDF etc.
Are you looking for schematics? or mechanical drawings, gerber plots, or what exactly?
Schematics are at http://arduino.cc/en/uploads/Main/arduino-duemilanove-schematic.pdf
Mechanical drawing of the PCB.
I'm not sure those are officially available. I mean to say, I'm sure it's been done, but I've never come across it.
Umm, you just want the board dimensions and positioning of the holes?
I made one up for that from the EAGLE files. I'll see if I can find it.
The headers and positioning of everything else you can also get from the EAGLE files, it's especially useful if you just print it out 1:1 scale then you can get an idea as to the sizes of boards and positioning, even if you don't own the board.
Mowcius
I'm only interested in the location of the headers, mounting holes, board outline, and maybe the DC jack.
I have got the header positions relative to each other (1.9" apart), presumably they are equally placed "side to side" so to speak, and I have the overall dimensions of the board (2.1 x 2.7") so I can place them in one axis but not the other.
I also know about the 160thou spacing between two of the headers.
Also there is the locations of the mounting holes and the weird shape at the front of the board.
I would have thought this was available in a format that anyone could read, not all of us use Eagle 
If I had a board I'd just measure it but I don't so any help would be appreciated. When (if) I get the info I'll create a PDF or JPEG that everyone can read.
If I had a board I'd just measure it but I don't so any help would be appreciated. When (if) I get the info I'll create a PDF or JPEG that everyone can read.
Right, hang on a few minutes, I'll see what I have
This is what I use for my covers that fit like a glove
All dimensions in mm.
Mowcius
That's fantastic, thanks Mowcius.
I still need to place the header but can probably scale that close enough from a photo of a board.
Is this from measurements of a board?
Those are from measuring my board and I know it's right from using my covers on the boards
Obviously the chamfers on the corners are not on the boards, I just added them.
Mowcius
OK here's a first draft, basically a copy of Mowcius' drawing but I've added the headers.
Looking at some of the numbers though you gotta wonder, according to the Arduino site the board is 2.1x2.7", that's 53.34x68.58mm, pretty close and to be honest well good enough. But does the site just round to the nearest 1/10th inch or is the board Mowcius measured slighty out of spec?
I might do another version working on the assumption that despite being European the Arduino guys actually worked with an imperial grid when designing the board.
Well the holes are in the right place, I think I may have slightly underestimated the extremeties of the board and it will probably be slightly different on different boards.
The other thing is, as you say. As the boards were designed on EAGLE, they will have been done to inch sizing to match hole spacing.
What is it that you are designing for?
How accurate does it need to be or are you just doing it?
I suggest for component placing and the rest, you get EAGLE and use that to get it.
What I did was only designed to be for the hole spacing and the rough board size.
Mowcius
Looking at the Eagle board file, I agree with mowcius that he just got the measurements (for the board size) off by a tiny bit. The grid on the board file is defaulted to 2 mil, and the line segment that defines the left edge of the board is 2100 mil long. The rightmost edge is at 2700 mil, so the board is truly 2.1 x 2.7 inches.
they have inches in italy??
Thanks for the pictures. I snatched them both. Great for reference. Yeah, they probably used mm units for wherever possible and only inch units for those parts with 0.1" pitch, like the pin headers and DIP maybe.
Here's an imperial version.
I would say that it's pretty right in the important areas (ie mounting holes and header location), the "tongue" is not quit symetrical and is possibly a bit out.
I emphasize that the headers have been located based on me scaling some photos from the web and making some assumptions. Not exactly best engineering practice but we work with what we got.
I'll package both as a PDF soon, meanwhile if anyone wants to apply a sanity filter that would be good.
@Mowcius
I'm designing a clone (sort of), so the header and hole locations are important, the board outline doesn't matter that much and other components not at all with the possible exception of the DC jack, I just like things to be right.
I tried using Eagle and despite having been a freelance PCB designer in a previous life I gave up after 10 minutes. I will reinstall though if for no other reason than to get dimensions of things like this.
Looks very nice. I did compare it to the Duemilanove Eagle files and spotted two discrepancies on the "tongue" you might want to fix. The 1.45" vertical dimension should be 1.49" and the 1.55" dimension should be 1.59" 
Whoo hoo!
Thanks cjands, I've taken the liberty of rounding those two numbers up by 10 thou, I hope you don't mind. It won't affect anything and makes the numbers all nicely sitting at 1 decimal place (except the infamous J3 location).
Here's the (hopefully) final version.
If there's no more mods after say a day I'll post the PDF.
This should be definitive. It was derived form the Eagle artwork for the Real Arduino.
http://siliconrailway.com/images/schematics/EP2193_mech.pdf
The original measurements are all imperial. This is taken from my LEDuino layout files, the mechanical features layer. And no, please don't ask, it is is Altium Designer and I cant export it to anything else useful.
