Two months ago, I started working with the beta. First impressions, were very favorable, but over the last two months, it started getting flakey, with some annoyingly persistent error messages, Remote Control not working consistently, or at all, files dissapearing, media sharing not working...
Well, the CTP takes care of all of those problems, and even adds a few nice features... Media sharing to the 360 just works, you can choose to disregard notifications, they've added the capability for third party add-ins... This product looks ready to rock.
At it's core, WHS is primarily for backup and storage and sharing, and if that's all it did it looks like a worthwhile product, but with the capability to add add-ins to run on the server, it looks like a wonderful way to offload a lot of tasks like downloads and filesharing and other small tasks.
Can't wait to see what people create and how much more they add to this.