I search for solutions in this order: Past Code, Unreal Source, Wiki, BUF, groups.yahoo, google, screaming at monitor. – RegularX

From Unreal Wiki, The Unreal Engine Documentation Site

Textpad is a great text editor for UnrealScript.

Feature List?

[edit] Downnloads

• Get latest version from http://www.textpad.com

Syntax highlighting files:

• http://www.planetunreal.com/umodwizard/unrealscript.syn
• http://www.planetunreal.com/umodwizard/uscript_textpadsyntax.zip (updated version of the above. This has support for new UT2004 keywords, and also contains Windows Registry plug-in to associate UC files with TextPad)