Below is the list of PDF sharing sites: Very good for traffic ranking as I use it myself to rank some posts higher in search engines using this PDF sharing sites.

1. Scribd.com

2. Slideshare.com

3. Docstoc.com (Ranks faster – II)

4. Issuu.com

5. eSnips.com

6. DivShare.com

7. 4shared.com

8. Calameo.com (Ranks faster – I)

9. edocr.com

10. gazhoo.com

11. keepandshare.com

12. pdfcast.org (Ranks faster – III)

13. speedyshare.com

14. files.com

15. bigupload.com

Hope you like it.