IntelliJ IDEA - Full-featured tool with code-editing, testing, and refactoring support. - http://www.jetbrains.com/idea/
IDEtalk - A developer collaboration tool for IntelliJ IDEA Java IDE. [Freeware] - http://www.idetalk.com
Smardec - IntelliJ IDEA Plugins - IDEA Mouse Gestures: plugin for enabling mouse gestures in IDE. TabReorder: allows to reorder editor tabs using mouse (drag and drop) or keyboard shortcuts. - http://www.smardec.com/products/idea.html
TunnelliJ - IDEA plugin for sniffing and debugging network applications. [Freeware] - http://www.boruvka.net/software/tunnellij/
IntelliJ Community - Wiki for users of product. - http://www.intellij.org/twiki/bin/view/Main/WebHome
IntelliJ Technology Network - Support site for product. Web gateway to IntelliJ newsgroups and request tracker. - http://www.intellij.net/