I really liked the Wordle software. I have the students make personal word walls in their notebooks, and I really like that this program takes my words and creates a really cool image. With this program I can focus on content and not creativity. While it's great to focus on creativity, there isn't always time.
The other progam that I really like is Prezi. I have used Prezi in the past for presentations for the students and by the students. The kids really get a kick out of this program and they love how easy it is to use while still allowing them to be creative.