A fork in the road...

Alice came to a fork in the road.
'Which road do I take?' she asked. 
'Where do you want to go?' responded the Cheshire cat. 
'I don't know,' Alice answered. 
'Then,' said the cat, 'it doesn't matter.'
  
Lewis Carroll, 1832-1898
English Author, Mathematician and Deacon

Mono for Android

How to prepare the environment with offline installers for Windows.

Android SDK/AVD Manager
http://dl.google.com/android/installer_r20.0.1-windows.exe

Android SDK Platforms
Download from http://{repository url}/{relevant file-name} (hint: see repository.xml)
e.g. - Platform 4.0 http://dl.google.com/android/repository/android-14_r03.zip
Move the ZIP file to {sdk-path}\temp directory and use SDK Manager to install the respective platform.

SDK Tools
http://dl.google.com/android/repository/tools_r20.0.1-windows.zip

JDK (1.6) for Mono (4.2.4)
http://download.xamarin.com/Installer/MonoForAndroid/jdk-6u31-windows-i586.exe
Note: JDK 1.7 is not supported

Mono for Android 4.2.4
http://download.xamarin.com/MonoforAndroid/Windows/mono-android-4.2.4.167234518.msi

MonoDevelop
Locate the downloads from: http://monodevelop.com/Download (listed below)
MonoDevelop 3.0.3.5 Installer
http://download.xamarin.com/monodevelop/Windows/MonoDevelop-3.0.3.5.msi
GTK# for .NET 2.12.10http://download.mono-project.com/gtk-sharp/gtk-sharp-2.12.10.win32.msi
.NET Framework 4.0 Standalone Installer
http://www.microsoft.com/en-us/download/details.aspx?id=17718

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Resource files:
http://dl.google.com/android/repository/repository-7.xml
http://xamarin.com/download/installer/Windows/MonoForAndroid/InstallationManifest.xml

Sources:
http://qdevarena.blogspot.com/2010/05/download-android-sdk-standalone-for.html
http://stackoverflow.com/questions/2766713/android-download-the-android-sdk-components-for-offline-install