I've got an early 2008 MBP (which is currently in for repairs as the screen has all these hotspots everywhere) and an older Gateway on which I dual-boot Ubuntu and XP (but mainly run Ubuntu). My MBP is my main work machine where I do my coding (PHP/JSP) and whatnot as well as my Serato machine. My Ubuntu laptop is basically my emergency backup for when/if my MBP isn't available and also a fun project machine for learning Linux system administration and the like.