Diigo - Better reading and research with annotation, highlighter, sticky notes, archiving, bookmarking & more. WiseMapping - Visual Thinking Evolution. Brainstorm and mind map online. Mibbit.com Webchat client. Stixy: For Flexible Online Creation Collaboration and Sharing.
Prezi - The Zooming Presentation Editor. Peg it up, Move it Around, Get it Done. Doodle: easy scheduling.