Camera manual says it supports SDXC (but they are too pricey and I wont need anything near 48gb!!!).
Camera supports class 10 too - not sure what my memory card I am using at the moment is (4gb Kingston from my point and shoot), but I noticed when experimenting with burst mode that I was waiting for the buffer to write to the card before I could continue shooting, hence why I decided to look into a new one with a faster read/write speed.
The manual suggests Lexmar, Sandisk, Panasonic etc...
Forgot to add - I wanted something farily quick just incase I take any video on honeymoon (cough cough

), and the 1080p 24fps was a bit jerky on my current memory card.