I have an early 2008 MacBook with 2 GB of memory. Ever since I installed Snow Leopard, my memory has been constantly used up, even if I didn't have any applications open. Usually, at the most I will have 300 MB free, but it often drops to about 60. The computer runs fine and does not seem slow. When I restart my computer that will increase to about 1.5 GB, but as soon as I start opening and closing applications, it begins to all be wired, active, or inactive. Is this a problem and is there a way to fix it? Thanks.