Depending on your audience, one thing I have started to do is utilize a link for a public share folder OR private share folder into an online storage facility. So I sign up with live.com, only to use their email, and keep the other applications from installing. Then I go to skydrive.live.com and create a specific folder for my pdf file. upload the PDF and set the folder to public. Skydrive will offer you link you can pass along within your newsletter and the people can download through that link. If you want to shorten or try and customize the link, you can try and go to http://www.tinyurl.com and customize the referring link. Some on line storage facilities have a way to share like dropbox and maybe box.net. I know all three of these to be worthy and honest vendors of this technology, but be careful about randomly looking for a vendor that is not well known as a public share group. Additionally, you can convince your audience to follow your Twitter or Blog or Facebook account, and in turn increase your signup numbers and offer links ONLY through there... which will utilize this these public share folders.
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