Google Docs now allows you to upload PDF files to store them online. You can view uploaded PDFs right in your browser, and determine who else should have access.
Standard, Premier, Education, Team and Partner Editions
How to access what's new:
Sign in to Google Docs and click 'Upload' to locate and upload a PDF. To share an uploaded PDF from your document list, select the PDF and click 'Share' to specify who should have access.