You download a free program. There are two that I know of offhand: CutePDF Writer and PDFCreator. (I prefer PDFCreator)
Then in your document, which could be Word or Eclipse or whatever program, hit PRINT. Then choose PDFCreator as the printer. It will ask you to save it to a location. Voila! Better to send a pdf since the text can't be changed -unless someone has the expensive $350 version.
Here's a download link: http://download.cnet.com/PDFCreator/3000-2064_4-10558866.html
Cindy L.A.
Alt-O to print. Click Setup. Choose Cute PDF or PDF Creator (whichever you loaded with Eclipse). Print as usual. It will save to your desktop, probably. Email with the PDF attached. Easy-peasy!
You have to have the Cute PDF maker. I had to download it from the Eclipse update section. Then when you go to print, you choose the Cute PDF instead of an actual printer, and it will create an Adobe-type file that is a true PDF.