These are good questions!
I think MyHouse Online works pretty well, but
other forum users can answer that more in depth.
You can run the MyHouse Remote from any
Windows computer in Internet Explorer, as you
can install ActiveX controls.
There aren't any e-mail command features in
MyHouse Online, but that's an interesting
concept. I believe there is an add-on
developed by one of our customers that lets
you send commands with IM.
You don't have to enable any form of computer
sharing to use MyHouse Online.