build_info.rb

## about (plain_text)

For more features you might like to try ck_fu plugin - http://r38y.github.com/ck_fu/

## config/deploy.rb

task :build_info do
  unix_user = `whoami`.strip
  run "echo 'Version #{current_revision} deployed by #{unix_user} at #{Time.now}' > #{current_path}/lib/BUILD_INFO"
end

after "deploy", "build_info"

## helpers/your_helper.rb - kudos to http://r38y.github.com/ck_fu/

def build_info
  file = RAILS_ROOT + "/lib/BUILD_INFO"
  File.exists?(file) ? File.open(file).read.strip : nil
end

## views/your_view.html.erb

<%= build_info %>