First

info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>action</key>
+	<false/>
+	<key>category</key>
+	<string>SCRIPTS</string>
+	<key>command</key>
+	<string>ruby install_dmg.rb</string>
+	<key>escapequery</key>
+	<true/>
+	<key>escapequerybackquotes</key>
+	<true/>
+	<key>escapequerybrackets</key>
+	<true/>
+	<key>escapequeryquotes</key>
+	<true/>
+	<key>escapequerysemicolons</key>
+	<true/>
+	<key>growloutput</key>
+	<true/>
+	<key>growloutputsticky</key>
+	<false/>
+	<key>keyword</key>
+	<string>dmg</string>
+	<key>logging</key>
+	<false/>
+	<key>silent</key>
+	<true/>
+	<key>subtitle</key>
+	<string>Finds the most recent .dmg file in the downloads folder and automatically installs the app inside of it. Then delets the .dmg file.</string>
+	<key>title</key>
+	<string>Install DMG</string>
+</dict>
+</plist>

install_dmg.rb

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+    #!/usr/bin/env ruby
+
+    require 'fileutils'
+    require 'pathname'
+    include FileUtils
+
+    #go to downloads directory
+    puts "installing most recent .dmg"
+    cd File.expand_path("~/Downloads/")
+    path = Pathname.new('.')
+
+    #find most recent .dmg file
+    files = path.entries.collect { |file| path+file }.sort { |file1,file2| file1.ctime <=> file2.ctime }
+    files.reject! { |file| ((file.file? and file.to_s.include?(".dmg")) ? false : true) }
+    last_dmg = files.last
+
+    #if there is no .dmg file then reject this.
+    if !last_dmg
+      puts "No DMG files" 
+      exit
+    end
+
+    puts "Mounting #{last_dmg}"
+
+    mount_point = Pathname.new "/Volumes/#{last_dmg}"
+
+    result = `hdiutil attach -mountpoint #{mount_point}  #{last_dmg}`
+
+    #find any apps in the mounted dmg
+    files = mount_point.entries.collect { |file| mount_point+file }
+    files.reject! { |file| ((file.to_s.include?(".app")) ? false : true) }
+
+    files.each { |app| 
+      puts "Copying #{app} to Applications folder"
+      `cp -a #{app} /Applications/` 
+    }
+
+    #unmount the .dmg
+    puts "Unmounting #{last_dmg}"
+    result = `hdiutil detach #{mount_point}`
+    puts "Finished installing #{last_dmg}"
+
+
+    #delete the .dmg
+    rm last_dmg 

kudos.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>creator</key>
+	<string>Christian Schlensker</string>
+	<key>website</key>
+	<string>http://cswebartisan.com</string>
+</dict>
+</plist>