From: "Jim Kearney" <jim(a)jkearney.com> Olimex (in Bulgaria) claims to accept them, but I don't think you would get any holes drilled. I just tried to convert a PDF file to Gerber by going to a BMP file and then converting that to an Eagle CAD script file, but it eventually failed because Eagle couldn't handle the number of rectangles that the simplistic converter generated. In principle it could work, if the converter made bigger rectangles than one per source pixel. LEADtools supports Gerber format as output in their libraries, so any of their tools might work. For example, ePrint (http://www.leadtools.com/Utilities/PrinterDriver/eprint_printer_driver.htm) is a generic Windows printer driver that has Gerber in its output format list. None of these work very well, though, because they're a lot of work and you don't have a drill file. I think in the end the only real solution is to get a Gerber file somehow, even if you have to re-enter the design in your CAD software. Toner transfer, iron-on and CNC milling all take far too much work for not particularly good results.