Eye-Fi – the company that makes the Wi-Fi-enabled SD cards we use for covering trade-shows – has launched a Eye-Fi Cloud, a new app and service that stores all your photos in the cloud, whether you took them on your iPhone or a big fancy camera.

Last week at the Mobile World Congress in Barcelona, Spain, a curious, unexpected thing happened: I used an Eye-Fi Mobi card to shoot and share photos from my camera to my iPhone and it worked – almost flawlessly.

As regular readers will know, I have tried Eye-Fi’s cards over and over, both here and when I wrote for Wired’s Gadget Lab, and I could never get on with them. The problems ran from annoyances to plain bad design and broken functionality.

This time, though, the card came through. In fact, I couldn’t have covered the show so well without it. Read on to see how we covered the show.

Eye-Fi has launched Eye-Fi Labs, a place to find test versions of new software. The first thing that you might be interested in is the Eye-Fi Mobi Desktop Receiver for Mac, an app that will let you beam photos from your Eye-Fi Mobi card direct to your Mac.

Eye-Fi has just added a new 32GB model to its Mobi card lineup. This means that you can now shoot for days and then, when you decide to transfer all those photos to your iPad, iPhone or Mac, sit for another few days as the pictures are sent across via Wi-Fi.

Here’s a fantastic tip for iPhoneographers: did you know that you can transfer photos from your Wi-Fi-enabled SD card to your iPad while it is connected to the iPad using the camera connection kit? This amazing nugget was discovered by The iPad For Photographers author Jeff Carlson.

I have used a variety of Eye-Fi cards in the past, both top-end, RAW-compatible Eye-Fi branded cards, and SanDisk’s licensed versions. And all of them have sucked. But the folks at Photojojo insisted I try out the new 8GB Eye-Fi mobi, a card designed to pair with an iDevice and let you seamlessly transfer pictures from any camera to your iPhone or iPad.

And — to my huge surprise — it’s fantastic.

Eye-Fi’s new Mobi cards are designed to work better with iOS and Android apps, making wireless transfers from your camera to your iDevice much easier. The iOS app has been updated, too, bringing support for the iPhone 5’s larger screen, just 8 months after it was launched. This, combined with the crappy non-native OS X app shows that Eye-Fi is getting really serious about Apple gear.

Eye-Fi has updated its top-of-the-range Pro X2 SD card from 8GB to 16GB, upped the speed to Class and kept the price at the same ridiculous $99. The X2 is the card to buy if you need everything Eye-Fi has to offer: geotagging, direct transfer to your iDevice and RAW file support. But it might not necessarily be the one you want.