Some tools you should not leave home without

In no specific order:

• After years of searching for hierarchical to-do list managers, frustrating outline and OPML editors, buggy project trackers I found this - ToDoList. It's clean, free (as in speech) and surprisingly, has really nice features
• yWork's brilliant diagram editor - Graphity or it's thick client cousin - yEd 
• XMind for mind mapping and brainstorming
• A decent screen capture and annotation tool - Screenpresso
• Notepad++, naturally