I just went through the top 20 web tools countdown. I came across many tools that I hadn't even heard of before. I'm going to list some of my reactions here.
I've used Glogster before and have found value in it. My students created a glog on cell organelles. Not only did the kids enjoy creating the glogs (the learning curve was minimal), they were able to create great visuals to go along with analogies they created for each organelle. I will most likely continue using Glogster in the future.
Prezi is a tool that I've heard about before but never got the chance to explore. I've seen presentations created through Prezi. To me, Prezi is much like slides on a PowerPoint except that it provides a lot more flexibility. Based off of the examples that I've seen, the presentations flow much better and do a better job showing connections between topics.
This is a tool that allows you to take a picture and have the picture move its mouth according to the text you provide. I think of this as more of a gimmick tool. I don't mean that in a negative way. This could be used as a great hook. I don't see this as something you would use a lot, but it could really get the attention of students at the beginning of a lesson or really hammer home a central point at the conclusion of a lesson.
This is a website that allows students to make comic strips. This tool I know very little about. I plan on exploring this during the week. I will give you an update on what I learn/think.
Here's another one that I know very little about. You create a dialogue between characters. Then, you can use this tool to create an animation to fit your dialogue. I read on a blog (my new knowledge on blogs helped out here) about how he used it his foreign language class. The teacher provided a positive review on the use of this tool. I plan on exploring this one a little further this week.
I will spend some more time exploring these. I'll provide some updates as the week goes on. If you have any experiences with these tools before, don't be afraid to comment. I would love to hear if you felt they were worthwhile using or not. Also, don't be afraid to brag about the cool lesson plans you've used them for.