I've been a long-time fan of the Eye-Fi SD cards. My primary use for them is to have all my photos automatically uploaded to Flickr from my camera. It turns out I'm lazy and having to manually copy photos off an SD card and upload them is too much work.
Earlier this week, Eye-fi announced they are discontinuing the online services for the "Pro" cards in favor of the new cloud-connected "Mobi" ones. Since my primary use of the Eye-fi card is to upload my photos to Flickr, I have no interest in paying for their cloud service. Time to look for another card! Most of the other wifi SD cards on the market come with an iOS/Android app, and basically all they let you do is view the photos from the app if your phone is connected to the card's wifi. Then I discovered the Toshiba FlashAir card, which has a developer site and encourages people to build things on top of the card.