HTC SENSE .com has popped up on the web and is going to be a portal for future users of HTCs Sense devices. You can check out the website and register your email for more info. The website itself will feature a variety of content for your HTC Sense device.
The HTC Hub will feature all the apps, wallpapers, etc. your heart desires. Think of it as your own personal app and information store. Several other manufacturers and carriers have basically this same premise going on their various sites so nothing new to people who have this available already. But for the future HTC Sense device users Im sure this will come in handy.