Picasa and flickr both allow you to stream in your latest photos into your blog, using one of their gadgets. Good thing to remember when I set up my classroom blog!
Photobucket.com -- you can upload quotes and have them directly on your photo, get lyrics, change backgrounds. No copyright on the music -- you can just download. You can upload your photos directly onto facebook. Can do themes of your page. Can create slideshows Online scrapbooking.
Flickr.com -- need a yahoo account. Creative commons has tons of pictures you can use for educational purposes.
Slide.com -- you can create a slide show and post it on your blog.
These are public domain, so share away!