I actually think this is a somewhat innovative way to get around the restriction on background applications, which I am growing to think is a good restriction.
Maybe background apps could be more a feasibility on a 3gs, but on my 3G, the memory gets clogged after using just Safari and Mail (which stay open after closing). Imagine if 3rd party applications were allowed to stay open as well! I'd have to use the
now banned free memory applications even more frequently or restart my phone.
Granted, I'm not signing up for this service. A little too stalker-ish for me.