I wasn't sure if this is SuperUser or StackOverflow material, but since the end result is for programming I'll start here. I'm looking for a lightweight editor with svn support. What is your favorite?
NotePad++, TortoiseSVN, non-Integrated.
Or, if you really need integration, it looks like somebody wrote a plugin:
http://www.switchonthecode.com/tech-news/notepadplusplus-subversion-plugin
And if you are using Delphi, and/or want an easy way to add basic SVN to Delphi, use this method to add SVN commands to the TOOLS menu: http://delphi.wikia.com/wiki/Adding_TortoiseSVN_to_the_Tools_menu
ALSO - I think the trick for adding SVN to Delphi via the Tools menu, would work for notepad++ also - it's a very generic approach.
I'm not sure that "simple" is the right word to describe it, but Emacs is a fantastic text editor with SVN support built in. Why do you need SVN support built into your editor?
The Agent SVN is an implemention of the Microsoft Common Source Code Control Interface (MSSCCI) for Subversion, which basically means it will work with any editor/IDE that supports the MSSCCI interface.
The MSSCCI interface is designed to allow the editor/IDE to integrate with the source control.
NOTE: Agent SVN is shareware.