Hi Ed,
mojoPortal may work in some existing farm scenarios that synchronize files across the nodes.
I have no progress to report as of yet in implementing support for web farms that don't have that ability, its still in the planning stage.
Azure is on my radar and watching it mature but I'm not in a hurry for it and I have not yet done any exploratory on what it would take to support it.
There also exist opportunites to make linux appliances for the Amazon cloud using Suse Studio but its not my top priority.
Eventually I will get to these things, but the vast majority of mojoPortal users are not in need of web farm support so following the 80/20 rule my priority is adding value for the most users.
Best,
Joe