The main obstacle in doing this is, of course, the lack of "space" to upload your document.
One method to accomplish this is embedding. You can use an utility like Scribd, or slideshare. These websites show you how to do the needful on Scribd, and on slideshare. Essentially, this involves registering on the particular website and uploading your presentation there. The process is very similar to how you would upload movies onto YouTube and link to it from your blog.
Another method, which I guess is obvious to many people, exploits the ubiquity of gmail accounts.
1. Go to docs.google.com. Login.
2. Select "Upload" (in the blue band), and upload your file.
3. "Open" the document
4. On the top right corner select "Share -> Get Link to Share"
5. Get the link, and from your blogger site just link to it as you would any other website.
One advantage of this method is that anybody can download the file in whatever format it was uploaded.