This is pretty good for a notebook computer. In this time I've taken it to the east coast and back, installed/removed various pieces of software, joined and unjoined various wired and wireless networks, and put it to sleep and woke it up one or more times each day.
13:38 up 19 days, 15:12, 2 users, load averages: 0.86 1.18 1.58
I never got this sort of stability out of Tiger--I needed to reboot every few weeks for one reason or another. I never ever had this sort of stability with Windows. Installing software on Windows usually causes a reboot, yes? In fact, the Windows XP VM that is running on my MacBook was restarted last Thursday.