Since Sahi script is based on javascript, it is easy to provide text editor/IDE support.
Textpad
Download sahi_textpad.zip
Unzip the file.
Install sahi.syn file as given here.
Copy sahi.TCL to C:\Documents and Settings\<UserName>\Application Data\TextPad
Restart textpad.
jEdit
Download Sahi edit mode.
Installation:
1. Copy sahi.xml to the /modes directory in the jEdit root folder
2. Add the following XML node to the file "catalog" in the same directory
<MODE NAME="sahi" FILE="sahi.xml" FILE_NAME_GLOB="*.sah" />
Thanks to Anders Lund Haheim for this contribution.