DocPad is a free and superior alternative to Notepad. In addition to the plain text editing it has a lot many features like,
Alphabetization of paragraphs
Block indention and unindention
Calculator, calendar, and character map tools
Convert various encodings including Base-64, Quoted-Printable, UTF-7, etc.
Convert to lower/upper/title/sentence case
Cut, copy, and paste
File type association tool
File drag & drop
Jump to line/character
Keyboard macros (unlimited in size and number)
Print and Print Preview (user can adjust margins, font, page numbering).
Recent file history
Search and replace, including case-insensitive, whole-word, and wildcard searches.
Selectable character set
Skinnable user interface
Statistics on characters, words, lines, and paragraphs
Text drag & drop
Toolbar, Status Bar
Trim trailing spaces from lines
Variable-pitch fonts support
I have to say, while it is fully loaded with featues, some of the themes are childish and makes feel like the DOS of 1990s. Download DocPad here