Why bother charging anything? Just use cords to power the devices directly.
Someone else mentioned an inductive desk. Same thing. Plug your mouse, keyboard and magic track pad into your computer and done.
No batteries. Wired power.
Yeah, I don't understand why everybody's going crazy over wireless keyboards and mice. Ok for a HTPC, but iMac? It's infront of you on your desk, you're sitting 50cm-1m from it anyway. I just don't get it...