Sold something on ebay and got around £45 for it so I decided to put the money to work to buy more ram for my mac. Got a general vibe from this forum that crucial was the way to go so used their quick selection and got 4GB of Ram for my unibody mac for around £43. I selected free post as I didn't really need it in a hurry and thought at worst it would arrive on the weekend. That was late Sunday night, it is now Tuesday and it arrived in the morning, I was so impressed. Especially as Sunday isn't a working day so theoretically it arrived next day. I went in and installed it which was a breeze to do and booted it up and it worked perfect, system performance generally all round has improved, especially graphics, which have got a lot smoother somehow (more memory being given to the NVidea chip?) and the amount of CPU used has now decreased significantly, if anybody could explain why I would be grateful. I am hugely happy with my experience with crucial and would recommend them to any one who is looking for that little extra power from their mac.