I use Ultra Edit for all my programming. It support several features that I use a lot:

• customizable syntax highlighting modes
• column (rectangle) selection/cut/paste/
• search/replace in multiple files
• file diff comparison
• projects
• understands DOS/UNIX/MAC line endings, macros can convert a file quickly
• brace matching (I just found this - awesome)
• bookmarks (helpful in large codebases)
• color selector (good for html)