Box.net is one of many great sites to host your files on. Essentially, it is a virtual storage place for your files! For free you get 1GB of storage.
A great feature is that you can also create a great widget to put on your blog to share your files with others (see my box.net widget in the sidebar).
It's reasonably easy to join and upload your files. I suggest if you are interested in a widget for your blog that you join and upload your files all on the one page here at the Box Widget page.
Once you have browsed and chosen your files, create a box.net account using your email address. You can then upload your documents and grab the code to put on your blog.
In Blogger blogs go to Layout>Page Elements>Add Page Element>HTML/Java script and paste in the code to add the widget to your sidebar. You can then save and view your new box.net widget and files on your blog!
Another popular hosting site used by educators I know is esnips which gives you a much greater storage (5GB) although you don't get a widget that is quite as good to add to your blog. Wikispaces could be yet another option! (if you want a wikispaces account for educational use click here)
It's really handy to have some of your important files hosted online, either to share or just to have access to your most used files across a variety of computers. As a teacher, you could also host documents for parents and caregivers to access, like notes to help with homework or documents for how they can help their child with their reading etc.
Please feel free to browse my Box (in my sidebar), currently it's all blogging related. I'll continue to add to it with more documents over time! If you find any useful, please leave me a comment :D