The App Store is known for its large number of apps and particularly well-designed ones. A large proportion of those apps are games but we very rarely see design and fun gaming come together. With OLO Game ($1.99), we get just that and more.
If you really, really, really want interchangeable SLR lenses on your iPhone and are willing to do things the hard way, camera modder Bhautik Joshi may have just answered all your prayers. The Phone-O-Scope, invented by Joshi, makes use of an always handy laser pickup from a CD player, some PVC pipe couplers and, of course, duct tape to let you attach any regular SLR lens to your iPhone.