BowPad is a small and fast text editor with a ribbon user interface and syntax highlighting. Portable version available.

BowPad Features:

syntax highlighting for over 100 file types and languages
handling of many different encodings, including UTF-8, UTF-16 and even UTF-32
easy ribbon user interface
navigation hints in the vertical scrollbar
coloring of open tabs according to their path
extendable with plugins written in jscript or vbscript