If you're doing software development, I sure hope you're not just using the standard Windows Notepad to do your editing.  Notepad++  is a free source code editor (and Notepad replacement), which supports several programming languages, running under the MS Windows environment.

Some of the features include:

• Supported languages :C C++ Java C# XML HTML PHP CSS makefile ASCII art (.nfo) doxygen ini file batch file Javascript ASP VB/VBS SQL Objective-C RC resource file Pascal Perl Python Lua TeX TCL Assembler Ruby Lisp Scheme Properties Diff Smalltalk Postscript VHDL Ada Caml AutoIt KiXtart Matlab Verilog Haskell InnoSetup CMake
• WYSIWYG
• Syntax Highlighting and Syntax Folding
• User Defined Syntax Highlighting
• Auto-completion
• Multi-Document
• Multi-View
• Regular Expression Search/Replace supported
• Full Drag ‘N' Drop supported
• Dynamic position of Views
• File Status Auto-detection
• Zoom in and zoom out
• Multi-Language environment supported
• Bookmark
• Brace and Indent guideline Highlighting
• Macro recording and playback
• Windows Explorer Integration

I've been using Notepad++ for years and have never looked back.  It gives me IDE type features without running a full blown IDE.  Now that I've been doing a lot more web development using PHP, javascript and HTML, Notepad++ has continued to work flawlessly for me and is my editor of choice.  For those running PortableApps, there is a portable version of it as well (Notepad++ Portable Page: http://www.mi3soft.info/Software/Portable/notepadpp-portable).

If you haven't tried out Notepad++ yet, I suggest you give it a look.  I'm sure you'll be quite happy with it.