Some very global but essential wish list items to start with from me:

iMac
1. SSD standard (currently a really costly chooice)
2. Remove the black surrounding area from the screen.

iPhone 5
1. iPhoto in the cloud instead of local (current space is not enought)
2. Better battery life
3. Laser keyboard
4. SD slot
5. Intergraded beamer
6 proximity charge

iPad
1. Thinner and lighter design
2. Bigger disk space
3. USB and SD slots