2. Hasbro's my3D ($35, Target exclusive)
The my3D works by slipping your iPhone or iPod Touch into this viewmaster-like device, which then turns specially formatted Apple apps into wondrous 3D experiences, sometimes with 360 views. Reviews so far say that the advanced displays of later models work best, but that they're cool and results in an interesting experience.
3. GoPano micro 360 lens ($50, Kickstarter)
The GoPano started life as a Kickstarter project, where its creators asked for $20k. They hit their goal almost immediately, and the pledges continued to roll in. Currently, they're at about $90k funding with 31 days to go. The device snaps onto your iphone, then records everything around the phone simultaneously. The video demonstrates a kind of adapted street view.
4. DIY Macro lens
We featured this cool Instructables tutorial which teaches you how to convert the lens from a disposable camera onto a cool clip-on iPhone accessory that lets you take closer and better-focused pics. Can't argue with the price.
5. Microscope ($49, Firebox)
This microscope accessory measures 3.7cm(D) x 4.1cm(H) x 1.7cm(W), but it manages to achieve a 60x zoom for extreme science close ups. Also comes with three white LEDs.