Twiddla ( http://www.twiddla.com) is an online virtual whiteboard where folks can get together to mark up a document, website, image, or white board for group collaboration. Chats can also occur to allow folks to contribute and collaborate without being in the same room. Try it out: http://www.twiddla.com/767721 I uploaded the BYOT infographic and you can color on the page or circle images, draw, etc. In your classroom this would be a great way to have student collaborate on word problems, projects, analyzing literature, etc. As professionals you can use it to plan events or lessons with teachers from across campus, or from other campuses. Did I mention it is free and no sign in is required to use the site.
Linoit – (http://en.linoit.com/) I LOVE this site! This creates a virtual bulletin board with various backgrounds. Place sticky notes with due dates, images, videos, etc. This could be a great launching pad for your classroom if you display this on your screen at the beginning of the period or a place to organize resources for a project. Items can also be added from a iPhone/iPad (no android apps at this point). Items can also be added by email.