The ever increasing access to online Web 2.0 applications makes you wander sometimes whether you really need to buy any software.Gliffy is another great online tool. It's like an online replacement for Vision or Omnigraffle. And as with my previous post regarding Bubbl, it also makes for great collaboration. That makes it a great tool for use in and beyond the classroom.Go check it out - www.gliffy.comAnd here's an introductory video if you're interested:[youtube=]