It would depend on the model. The WiFi SD cards all use different methods to communicate. Some may be PlayBook compatible, some will definitely not be.
I,d like to send photo,s over from these wifi Sd cards to my playbook. Will it work?
In addition to peter9477's advice, it's always a good idea to do some independent research before starting a new thread. Type "eye-fi" in the search box near the top of the page - you will find lots of threads on this topic. It appears that the cute little devices don't work without an app for the PB.
there is an android app, that could be converted and used on the OS2 Beta (and hopefully the official release). I just don't have a eye-fi card to test it with. I would convert and sign it if someone did have one and wanted to give it a try.