A new web based maintenance mode tool has been released by Tim McFadden and is available for purchase here (with a 30 day free trial)
From the site “The new web based scheduler simplifies the process of scheduling maintenance mode for SCOM administrators and IT staff. You can easily schedule a computer group or any object to maintenance mode in seconds.”
The tool looks very polished and comprised a web based interface as well as a windows 8 app. There is also a really nice feature included which allows a shortcut to be placed on any server desktop which when used will place that specific server into maintenance, now that’s cool.
Site License with one year free updates $99
Site License with two years free updates $149