I was wishing something like this existed, but was surprised to find it does exist! Turn your ordinary digital camera into a wifi camera with one of these very cool SD card. Never remove your sd card again.
I've been using it on this trip. It takes a little setup at first, but now, after a day of taking pictures i just turn the camera power on while "near" my phone or tablet and it automatically/wirelessly transfers the pics to my phone, then my phone uploads them to picasa or other online service. Super simple...automagic!