Inspired by Florian Gross's Execute as Ruby Code Service for OS X (http://www.ruby-forum.com/topic/102680), I have created InstantERB. It uses the incredibly useful AutoHotKey utility. It will run any selected text through ERB.
For example, selecting the following block of text and hitting <Windows>+I:
The value of pi is approximately <%= Math::PI %>.
% 3.times do |i|
<%= i %>
% end
will yield:
The value of pi is approximately 3.14159265358979.
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Installation instructions:
Install AutoHotKey (http://www.autohotkey.com/)
Download http://www.jackchristensen.com/file_download/InstantERB.ahk
You can either run InstantERB.ahk directly or copy and paste it into your own AutoHotKey file.
Jack Christensen