I’m a very cheap guy who doesn’t like bloat and strives for efficiency (that’s why I’m here using CodeIgniter. =P), and I only use editors based off of Scintilla, the open-source code-editing component (which supports a tonne of languages including C, Java, JavaScript, PHP, HTML, CSS, Python, Perl and Pascal).
Geany has become my personal favourite, as I run it on all versions of Windows I currently use, and on my Kubuntu computers and virtual machines. A list of it’s features are:
-Auto-complete
-Multiple document support
-Project support
-Syntax highlighting
-Code folding
-Symbol lists
There are also auto-save, file browser, HTML characters and versioning plugins. Once again, extremely light weight IDE (especially in comparison to Eclipse or some of the other giant wooly mammoths).