The Phone-less Windows Mobile PDA is Not Dead Yet… In Japan: Willcom NS PDA for Your Binder pointed out an interesting retro (blast from the past) Windows CE 5.0 based PDA (no phone and not using the Windows Mobile shell) from Toshiba available in Japan…
Windows PDA fits in a binder
As you can see from the photo, it has ring holes to fit in a binder. This was a popular option for calculators and proto-PDA devices back in the early 1990s. It has a nice 480×800 pixel resolution display, a microSDHC slot that supports cards up to 16GB, 802.11b/g WiFi, NetFront browser with Flash Lite 3.1 support,
Willcom NS product page
Willcom NS (Toshiba product page)

YouTube video courtesy of gigazine