I think I could mention something... not really what You are looking for, I guess, but anyway... there is the possibility of using... LaTeX :scared:

It has some pros, like: it's free, You can achieve the best (at a professional level), not to mention that there are places where, if You show up with something made in e.g. MSWord instead of LaTeX, You can hope to get just spitted in the eye (so to say... an example? http://www.arxiv.org/), etc., etc. ...

But it has some cons: it's got a "slightly" steep learning curve (unless You are a programmer), it's "a bit" not-intuitive when coming to inserting pictures, is not WYSIWYG (You are going to write down a source file, which is then compiled to produce the final document, exactly as a C programmer writes the source and then compiles it to produce the executabble), etc., etc. ...

OK! OK! I know it is not what You are looking for... but LaTeX just must be mentioned when talking of a way to produce pdf files (but don't go to arxiv with a pdf, go with a ps! )