You can add links with the 'link' function, images with the'insert image' function, and video with 'insert a video'.
If you want to embed word documents I'd suggest setting yourself up a Scribd account and uploading your work there and then embedding it from there into your blog using the embed code. You can do the same with presentations by sett5ing yourself up a slideshare account and doing the same thing.
And, really, check out http://prezi.com/. It is free and you can make really interesting presentations and embed them in to your blogs quite easily.
Any questions, post a comment. All answers will be given as soon as I have ahcance to catch my breath (usually within 72 hours).