Anyone has a gerber file for the latest design of Arduino Diecimila? I found the Eagle schematic and layout file on Arduino website, but I need gerber file. I want to have a red Diecimila and PCB fab house need a gerber. 
You can load it in to Eagle (free) and export it to gerber.
Actually, you'll need like 6 "gerbers":
bottom soldermask (.sts)
bottom copper (.sol)
drills (.drd, .dri)
top copper (.cmp)
top soldermask (.stc)
top silkscreen (.plc)
Which is why it's so much more convenient to pass around an EAGLE .brd file. The drill file isn't really a gerber, but your board house will want it... Unfortunately, there are also differences between board house as to which layers should be "reverse" (if any), and other special requirements. While in theory publishing CAD files means anyone can go off and have a board fabricated, there's an unfortunate amount of knowledge and interaction required. Still, I prepared these unchecked gerbers if you want to try them out:
Gerbers from 21-oct-07 Arduino_NGDM.brd reference design
Thank you so much westfw! umm I trust your work, I'll order some boards with these files and will let you know how it goes. Thanks again.
Hi
u have gerber file for Arduino Serial Interface and for Arduino Mega?
i try to export gerber file from eagle but without succes
THX in advance!
There's an interesting question WRT open source hardware about just how much trouble the "providers" should have to go to to make sure "users" can actually use them. In the old days, vendors would sometimes provide "reference designs" for their more complex chips, and that would usually have a printed schematics and PCB layout "picture", plus sometimes a set of Gerber files so that you could reproduce the circuit board, and maybe a "bill of materials" so that you could know exactly which parts the board was designed to hold (a 47uF cap comes in a bunch of different sizes, for example.) That was ... something (and there are a lot of products out there based on reference designs), but if you wanted to make slight modifications of the design, it meant manually entering the schematic and PCB layout into some tool set that you owned; nearly starting from scratch.
The model used by the more "modern" open source projects (like Arduino, or the EMSL projects, or Adafruit) involves releasing the design files for some CAD package in a easily machine editable form. EAGLE is particularly nice, since CadSoft has EAGLE running on all the popular operating systems and has the freeware version around for anyone to use (for non-commercial purposes.) But it is certainly not required that design files be in any particular format, and even designs written in obscure and expensive CAD packages could still be legitimately "open source." (EMSL uses GEDA (itself open source SW), Solarbotics released their freeduino design in Protel format, and MDC released some of their designs in OSMOND, to mention a few examples.)
Likewise, it's not required to release open-source hardware designs in "ready to manufacture" form (gerbers, in particular. Gerbers pretty much suck as a descriptive/educational format, aren't easily editable, and are relatively obsolete from a technology point of view. But they're what the board houses all know how to deal with.) Asking the original developers to generate gerbers for you is a bit like asking the open source SW community to compile a program for you; not beyond possibility (witness the large number of binary distributions for popular packages), but not really within what you should EXPECT, either.
What kind of trouble did you have exporting the designs using EAGLE?
(and WHICH serial design were you talking about?)