1. A small bag that always produces exact change for whatever you're buying when you reach in to take money out. It would always reappear in my pocket if I dropped it/lost it and wouldn't produce monies for anyone but me and the people I approve. It would also be indestructible.
2. A benevolent, supernatural guardian to watch over Earth and correct disasters. Global warming would be reversed, earthquakes would end prematurely, hurricanes would be stopped in their tracks... This guardian would have the ultimate sense of good and evil, be bound to protect the earth, and be immortal and invulnerable.
3. Knowledge uploading, directly to the brain. Like in the Matrix. :D
I have too much time on my hands.
(Of course, this is without superpowers, unlimited wishes or other such cheaty things. If there were cheaty things I would have a lot more stuff on the list. :3)