Will upgrading my 07/08 white MacBook to Snow Leopard make a noticiable difference in my day-to-day computing? I've been reading articles about the new OS and from what I gather, I won't be able to take advantage of the new features in Snow Leopard. (64-bit, Grand Central, etc.) I've never upgraded or modified my MacBook since I purchased it. If Snow Leopard will make a significant difference then I will buy. If not, I'll just stick to what I've got.