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I use PDFCreator on a regular basis. It's a grea tool... it's totally free. It installs as a printer, so you can output from any program that can print into a PDF file. You just select print and select PDFCreator as your printer.
It's quite simple really. Download the Post Script file.
It's called Adobe Acrobat... but don't bother, it takes up a lot of space on your computer and you'll still have to download it from somewhere illegally. Just use PDFCreator, it's just as goot.