Hi. I have a white unibody MacBook 2.26 GB 4GB (installed 2GB myself) 1067Mhz. I bought it late last year and I was wondering to keep it in good working order what should I do to it in terms of maintenance? Should I use disk utility? if so how often? and what else I can do to keep it clean (internally i mean) and running at its best? Thanks in advance, Michael.