Step 1: Install Growl For Windows
Growl is a system notifier that originally came to life as a Mac OSX application. The kind souls at Growl for Windows have ported it over in .Net, so grab it and install it pronto.
Step 2: Install the VS2010 build notifier plugin
Growl uses various plugins for non growl-aware applications. The Growl Visual Studio Add-In needs to be installed after Growl ran for the fist time.
Step 5: Configure notifications
Open Growl, select your favourite display (or install extras, my favourite is Risor), then configure the VS addin so it doesn't notify on every project build, but only on solution build + project failures, such as: