Homeseer, I believe, also supports Insteon and Girder now supports Insteon, so if you already are familiar with that, you should be able to add this functionality easily and integrate fairly completely
I use Insteon and PowerHome. Thanks to Manny, I can get basic control via XLobby. It's not perfect and take a good while to setup, especially if you have many devices. I've got 25 and it took long enough
. I currently can "turn on" or "turn off" devices. I don't have anything setup to dim, brighten, etc. Powerhome also updates the status of the devices as they change, either by physically turning them off/on or if the change as a result of a macro or timer.
You can see my screen shot of my "automation" page here
http://www.xlobby.com/forum/viewtopic.php?t=4733
Enjoy!