I salute our widget overlords
so this means an app store of HTML(5) based widgets like the ones that have been around on Mac and PCs for years.
I guess if it doesn't drown in crud it's a nice idea... potentially multi-platfom (assuming browser support on Android, Nokia, WP7 etc) so simple weather or currency apps could reach a wide audience
can't see too many complex apps (or things people would pay money for) coming out of this though... but anything that stops folks worrying about Abjective C or Java or C# to knock up a quick data dashboard... all power to it, if it takes off and gets a decent footprint in the market