Hey Dave, like Richard said, you need to get a site hosted somewhere if you don't have one and put the PDF file on your site with a link from your Squidoo lens to your file. Squidoo won't host files for you--you have to link to your own site where you keep them.

Just a thought, I've got a lot of lenses up on Squidoo and if you have a free ebook you might want to consider putting a link up for your free ebook and say something like: Get My Free eBook Here. But have the link go to a squeeze page where you can opt-in names to build your list. If they opt in, have an auto-responder send them an email with a link to your file.

You'll need an auto-responder service to collect the names for you. You can build a good list doing this if you have a good ebook to offer for download.

Also, I've found if you write 2-3 articles and submit them to www.ezinearticles.com with a link to your Squidoo lens, you can get some good traffic and Google will notice the links and give you some juice to help your rankings for your lens. Posting a short video about your lens on YouTube and other video sites will get you good traffic to your lens as well!

Squidoo is cool and Google still loves it. Good luck!