When you are working outside with your laptop, the most important thing that you might consider is to maximize your battery lifetime. This is true especially when you are working on location where AC power is not readily available.
Typical laptop might last from 1.5 hour to 3 hours of normal use. So you might want to squeeze out all the battery juice and put it to good use.
Here are a few tips that I got from surfing the internet to save battery life when you are using Ubuntu (or GNU Linux OS in general) :
Ubuntu is friendly enough to provide a nice and friendly warning to me about the status of the laptop battery that I currently use. With Microsoft Windows (at least Windows XP), the laptop simply dies when the battery looses its juice.
Its nice to have this sort of reminder when you really need to change the battery.
No wonder I kept missing my blog posts, my CMOS battery finally runs out after 3 years of use. Guess I need to get a new battery now, or else I might fscked important appointments.
For the time being, ntpdate saves the day :)