I like Growl notifications for automated builds (and not much else – does anyone really need more distractions from IM, Facebook, Twitter?).
As of version 1.3, Growl is only available through AppStore for $1.99, but the source is still available online. So if you happen to have XCode installed, the following instructions will get you running.
1) You need Mercurial to retrieve Growl source. To Install Mercurial: sudo easy_install pip && sudo pip install Mercurial
2) In a terminal window:
hg clone https://code.google.com/p/growl/
3) In XCode, disable code signing.
4) Back in terminal:
xcodebuild -project Growl.xcodeproj -target Growl.app -configuration Release
5) Copy Growl.app to your Applications folder.
More detailed, illustrated instructions available at: https://pragmactic-osxer.blogspot.com/2011/11/building-growl.html