Oracle Enterprise Manager Desktop Widgets

Oracle has recently made available some desktop widgets that connect to OEM and display the status of monitored instances: http://www.oracle.com/technology/products/oem/widgets/index.html

They are quite neat, but the drill-down only functions if you have the relevant Management Packs installed.

You need to install Adobe Air, but it's really a one-click installation, there's not a lot involved. I generally find desktop widgets are only really useful if you have dual monitors, or a widescreen one, otherwise they get in the way.