If you want extra juice for your iPhone, there aren't that many options out there that don't look rather goofy. They're bulky, corded, or just plain ugly. But the PhoneSuit battery is a nice cange—only 17 mm thick.
Phones with gigantic screens, such as the HTC Evo, have a tough time lasting a full day on one battery charge. This makes having a secondary charger almost essential if you're going to be out and about all day.
The MiLi Pro is a LCOS, LED-driven projector for the iPhone and iPod Touch. Simply pop your iPhone into it and it can put a screen up on your wall.