I agree with most of what is being said anewfoundsin.
While it is extremely easy to get the firmware itself, and almost as easy to find a risk-taking developer selling UDID slots (Google it), it's buggy, as most betas are.
You'll find quite a bit of high-horse arguments against people like me who go $50/$50 with a buddy every year to test the software, and that is a legitmate and mostly really fun endeavor. But as the previous posters eluded to, if you aren't the type to patiently battle with bugs and major issues, it may not be worth the momentary "Oh cool! I have Notification Center!" lol
Regards and good luck if you decide to take the plunge, but please, if you do, do it through your own developer account. 🙂