bLADE Wiki for Windows PC and Mobile
bLADE Wiki is a personal wiki to let you take and manage notes. It runs on both Windows PC and Windows Mobile, and you can sync notes between them. You can write you notes on your PC, take them with you on your Windows Mobile cell phone, read and edit them on the fly, and sync them back to your PC again.
bLADE Wiki is a great little tool for taking notes, and I can only recommend it. The bLADE Wiki help pages have much more information.
bLADE Wiki is free.