I really like wordle. I used my latest entry from my "real" blog. I think this would be an interesting way to show students when they are repeating words too often. You can change the language and it stops filtering out the common English words. For instance, I know I used the word, photograph quite a bit. It's a good thing the post was about photographs.
I wasn't as thrilled with voki. The html I tried to past in here didn't work, which was just as well since my avatar merely said, "Does anyone have any ideas what I could use this for" because I didn't. By the way, I chose voki because I have used ANIMOTO before and prefer making this type of video on iMovie.
I can tell that I like glogster. I didn't do too much exploring, but I can see how this would be a great tool for students to use to make more creative presentations. They could add video and hyperlinks, etc. I'm looking forward to using this with my students this coming year.
I'm interested to see what other people want to use bookr for. I think I would use is as a way for students to present research or for creative writing students to present a story. I've had creative writing classes write children's books before, and this would be an interesting way to do that.