My first post from earlier today is not yet online (gotta make sure I'm not a spammer) but in the interim I've got Cumulus working with my WH1091. Nice interface design, intuitive, and it works with the WH1091. I tried Cumulus last night for the first time, had a few problems, but it was a bit late (plus I was watching TC Yasi whack Queensland and that distracted me a bit). Good stuff.
Cumulus works perfectly on a Mac running Parallels and WinXP.
Now all I need to do is work out the best place to put the sensors. The house is infested with wind- and rain-deflecting trees
fracto