Controlling your DSLR from your smartphone or tablet has never been ... smaller. Meet the CASE Remote Air, the self-proclaimed "world's smallest and most powerful smart camera controller."
The ability to use your smartphone as a remote for your DSLR can come in handy in a lot of situations. But if you don't have a DSLR with built-in wireless, or you want more control than the typical remote app will offer, the Weye Feye may be the solution for you.
Here's another option for DSLR-toting photogs who want to control their gear wirelessly from a distance without spending a fortune. It doesn't have the range of the CamRanger or the ability to send over a live view like, say, the built-in wireless on the Canon 6D; however, it's less than one sixth the price of the first, and you won't have to upgrade your camera to get it.
It's the Satechi Bluetooth Smart Trigger, and it comes in three versions that are compatible with a range of Canon and Nikon DSLRs (plus a couple of Pentax options) for only $45.