Nikon's shutter release from a distance of up to 300 feet. There's also GPS tagging, if you're into that sort of thing, and a toggle in the app for adjusting exposure length. The app itself's free, though the dongle will set you back a mighty $149. At least it communicates via Bluetooth, which won't require line of sight like Nikon's own IR remotes. Compatibility is set to expand to include Canon DSLRs and Android and BlackBerry smartphones in the future, but if you've already got a D5000 and an iPhone 4 lying around looking wistfully at one another, you can pre-order your BlueSLR at the source link below.