I am a PC user and bought an I Pad 2 last year just to show my photos. I have never been so frustrated with anything before, it is crazy hard to even easily put photos on the stupid thing. I bought the camera attachment so you can supposedly transfer photos but it doesn't work either. Even the Apple store couldn't make it work. I finally found an app that makes it a little easier.
So, in answer to you question I am not sure you can transfer by wi-fi on the D300s to anything. I have a D300 and don't know of any way. I hope someone on the forum does.