My favorite April Fool's items this year were some great products from Think Geek:
- Play-Doh 3D Printer
- Dharma Initiative Alarm Clock
- Wireless Extension Cords
- moodINQ Programmable Tattoo System
- PLAYMOBIL(TM) Apple Store Playset
Added later: Turns out most of these have actually been around for a while. Sorry about that; I hadn't seen them before, so I didn't know.