Slide Share is an amazing site. I wish I would have known about it a year ago when I was using more presentations in the classroom. This year I haven't been using as many since the age of kids in the ASLC is younger. I was also excited to see that OpenOffice presentations were able to be uploaded. We use NeoOffice at home and it was difficult to create a presentation at home and bring it to ASH to use with my kids. I browsed through a number of presentations and really thought that this one was well made and interesting:
I created a project last year for the ASLC where we learned about and then created mosaics. At the time, I used a PowerPoint presentation to teach what a mosaic is. I found the following presentation on SlideShare that would have really been nice last year. It has great picture examples of various mosaics.