Re: SD memory card.
Sony cards are called Memory Sticks (as opposed to SD), which is a completely different design. So you can't use that in SD/MMC slots.
As for SD, you could pretty much use any card, but I prefer branded. If you are doing video on your digicam use the faster cards as you can get longer clips. With still pictures it doesn't matter, it just decreases the time it takes for the picture to get stored on the card.