Embedding can be easy and very successful as well as encouraging to children and their learning. Our classes favourite would be Voicethread and designing their own games from Classtools. My class blog with heaps of embed examples.
Voicethread - a super easy web app that you can add images to and add voices using inbuilt microphones, Also a fabulous tool for collaborating with classes from other countries. Here is an example from two ESOL ch'n related to a book they had read - Octopus. Here are two examples of a collaborative voicethread - teaching a class in USA about Maoris - Maori words and Maori numbers.
Classtools - where they can create their own games. It can be tricky adding finding the code..we discovered the best way was to create our quizzes was to write the quiz in pages or word first and then use Firefox browser to create the game. Ch'n can create a huge variety of arcade games for classmates to play. Here is an example Egyptian quiz game created by 9 year olds.
Answer Garden is another favourite - we used it to brainstorm after an immersion activity on Egypt. It can be used in a mass of different ways and is easy to use and versatile. Teachers can use it too!
I have used Survey Monkey with classes before to collect and collate statistical data, however a great bunch of peeps seem to be using Poll Daddy so here goes with my first one! Love the ability to re-edit once finished and re-embed. Cool Tool!