Still don't think Notification Centre is a viable alternative to Dashboard. Just seems more inconvenient with no real benefit of its own. I'd love Dashboard to get a complete overhaul and widgets to be sold on the MAS, but I realise that is extremely unlikely. Perhaps as a compromise NC widgets could run in Dashboard (again, not very likely) - but nothing compares to the convenience of widgets which can completely overlay your screen with a transparent background enabled by one button tap.
Once you're used to the calculator, calendar, weather being available in a keystroke, scrolling up and down Today view in NC seems oddly fiddly.