Everyone wants to make Jeopardy games or Wheel of Fortune in their IWB software. Well, here's an easy cloud tool that works great when used with a smart board. Of course, use it as a pre-test, a formative assessment, or for just plain fun. But again, with a save-able URL, I feel better organized having my tools on the Web.
Skribl is another online sharable whiteboard. I'm happy- because they recently added an embed widget for sharing and collaborating. The user interface is kind of home-grown, but it's functional. With a login, you can save your boards for later use. It's not the prettiest UI, but saving is key.
Practice using adjectives and their comparative and superlative forms with the Trampolini Brothers. K-2, 3-5 Reading: Reading Comprehension. Vocabulary.
This is a page on the scholastic website that has interactive whiteboard activities for Earth Day. These activities include lessons on water conservation and recycling etc.