SlideShare has the potential for being enormously helpful, especially to busy educators who don't have the time to put together a presentation for every topic they teach. However, I found some slideshows more informative than others.
I am interested in origami and found one slideshow that consisted simply of the scanned-in pages of an origami instruction book. This is very helpful in learning to do origami, but I wonder if it isn't a copyright infringement.
The slideshows that are my favorites relate to organizing paper and clutter and I can always use help in that department. I left a comment on one of them.
My SlideShare account is at http://www.slideshare.net/RaeS