Notepad++ : start using a real text editor
Have you ever used Notepad? It’s very simple, which is good. However, it lacks the power and features of more advanced text editors.
Notepad++ is a free and very powerful text editor. Here are some Notepad++ features:

• Syntax Highlighting and Syntax Folding
• Print text in color
• User Defined Syntax Highlighting
• Auto-completion
• Edit several documents at the same time
• Synchronized scrolling between two documents
• Regular Expression Search/Replace
• Full Drag ‘N’ Drop support
• Zoom in and zoom out
• Place bookmarks in the text
• Macro recording and playback

For more details, check out the Notepad++ homepage.