For photos, I use Flickr. But for other documents...Which web based online application (hosted or to install on your personal web site) do you use for PDF or word files ? If there is a user management it would be also great (for example you decide that some persons, or everyone, can see some of your documents...).
Google Docs?
It is capable of storing PDFs but your word documents will be converted to the the google doc format. (which then can be converted back to Word or RTF or PDF etc'
The problem with Google Docs is that it changes the format of uploaded docs in its own format, with catastrophic consequences (page layout, links, summaries...). What I would like is to keep my original documents as is , if I want to .
I use a subversion repository. I can browse it on the web if I need to, though I usually use TortoiseSVN to access it on windows machines. It's password protected, and it even has version control! :-)
In the past I have created a small TrueCrypt container, zipped up my documents, added them to the TrueCrypt container and then e-mailed them to my GMail account.
Fiddly but effective. You can setup an Ant script on your desktop to create/update the zip and copy to the TrueCrypt folder and then perform the e-mail.
I have also used and am using DropBox for the same thing.