Apple has been able to create a seamless experience because it owns its entire PC chain, from designing the computer hardware through building the operating system through, in the iOS devices at least, approving individual software applications.
HP is the largest PC manufacturer in the world, and has significant market share in related markets like printers, cameras, and so on. I love that they're actually thinking about using this power to muscle in on what's hitherto been Apple's turf. They're creating a similarly seamless experience, but they're doing it at a better price, with far better distribution than Apple currently has, and with features that Apple hasn't managed to launch yet.
Seamless wire-free syncing, tethering, sharing and charging between elegant devices running an extremely user-friendly multitasking operating system? Awesome. Doing this with a development platform that innovative web developers can get up to speed with quickly? Even better.