I don't know if there are many mac users on this forum but i swear by them and this site has some brilliant pieces of freeware to make ure mac even better!!!
http://hmatt.com/mac/macbookfreeware.htmlI'd recommend dJay(great for mixing together 2 tracks or just speeding up or slowing down iAlertU(car alarm for your laptop) Desktopia(automatically change the background at times of the day) and iRecord (record from your iSight).