SlideShare is a cool FREE site where you can upload your slides from PowerPoint or PDF file so they can be viewed online. You can even embed a link in your blog and upload an MP3 file that you can sync with your images. I haven’t done the latter, but this could be very interesting.
I encourage all artists to learn to use PowerPoint. You just never know when someone is going to ask you to do a presentation about your art. This would be good practice for you.
I uploaded one of my workshop PPT slideshows and it's apparent that I'd need to change a bunch of fonts for it to work. Just use the basic serif and sans serif fonts and test them before you spend a lot of time on the presentation