Probably the easiest way to share files with others, these are some examples of sites that allow you to create a free account and post documents and other files that can be shared or kept private.
Designed specifically for document sharing, these are sites that allow you to post and share your documents.
These online document creation/collaboration suites allow you to upload and share documents, and even create (and collaborate on) documents online.
These are just a few examples of website builders or blogs that will allow you to attach documents.
If you are just posting a few documents, or even a single presentation, I'd recommend Drop.io as a quick and easy way to do it. However I'm also a fan of creating web pages with Google Sites (check out eipstech.com/presentations). As with most tasks, your tool choice is a matter of preference. Hopefully this will help you get started.