What are some good technology devices that should have caught on, but didn't?

[KungKras]

kain_kusanagi said:
1. Dreamcast
2. Neo Geo Pocket Color
3. Windows CE devices (PDA and Tablets)
4. Windows Phone 7
5. Sega Saturn
6. Sega CD
7. HD DVD (Cheaper, Faster, and just as HD as Blu-Ray)
8. Japanese Xbox 360
9. Virtual Reality Headsets
10. Turbo Duo

Pretty much this, except I'm glad windows phone 7 didn't catch on.