WolframAlpha Widgetsaremini applications built on Wolfram Alpha queries. You can share them in several ways – Facebook and Twitter for example or embed them in a blog or website. Either use a widget from the growing gallery (note the categories on the right) – seeMathematicshere or create your own.
Answer Gardenprovides a simple and interesting way to get feedback. Responses (which must be 20 characters or less) are added to a word cloud. Create your question, very easily (no registration is required) by entering your question and clicking Create, you can then note the url or embed code.
As people post responses the word cloudwill develop. (Click on the word cloud link to give your favourite Web 2.0 tool!). Hovering over a response gives the number of people who have made that response. It is possible to change settings such as colour but it is not necessary to do so.