Continuing the idea from Ghetto Java blog, this is my list with preferred IDEA plugins, "cheating" ;) a bit, because I have 6 preferred ones, the most favorite at the top:

1. TMATE - A combined IntelliJ IDEA plugin and web application that helps you work smarter and more efficiently with your CVS and/or Subversion repositories . My favorite!

2.1. Sequence plugin - A Simple Sequence Diagram Generator.

2.2. SQL Query Plugin - A tool for executing SQL statements through a JDBC connection.

3. Copy As HTML - Adds menu items "Copy as HTML" to main menu and editor popup. Will copy the current selection or the complete editor buffer.

4. Copyright - This plugin is used to ensure files in a project or module have a consistent copyright notice. Copyright notices can be created for the following file types: Java, JavaScript?, JSP, JSPx, XML, HTML, xHTML, DTD, Properties, and CSS.

5. JUnit generator - A very simple plugin that generates JUnit test case skeleton including all the methods of tested class.

And without mentioning my own non-plugin, here there are few very honorable mentions: generate toString, Spelling Checker and "LYCAY - Let Your Code plAY" ;)

Which are yours?