Scannable is one my favorite tools. I use it all the time for work and outside school. It's an app that takes a picture of basically anything and turns it into a pdf file that you can easily share with anyone.
Zunal is a tool that makes creating a web quest really easy. Web quests are a great way to individualize your instruction and provide scaffolded learning opportunities for your students. Zunal even includes a webquest rubric for assessing your students' work. Finally, lots of teachers have shared their webquests, so you might even find one that's already been created on the topic you need.
Using web 2.0 in your classes can make your classes more interesting and engage your students more fully in your classes. However, adding images to your assignments can be difficult because you want to use images in the public domain. You can search for images, video and audio files, and more that are all free to use and in the public domain. It's a great resource for your "regular" assignments, too!
Edueto is a great tool for making practice assignments, such as matching activities, fill-in-the-blank questions, and sorting. You can quickly send the assignment to your students, and they are automatically assessed for immediate feedback.